Extended ASCII, but again, this is
NOT ASCII.
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ing it, as often
you special case some characters (like control characters) to avoid
messing things up too much for display.
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Code o
so
keywords could flag errors (but late enough that you don't normalize
inside strings and such), or you need to normalize late (as is done) but
then add a check to see if the text became the same as a keyword.
Seems a shame to go to extra work to flag as an error something th
lass
> PiMultiple that would represent a fractional multiple of pi?
>
> PI = PiMultiple(1)
> assert PI / 2 == PiMultiple(1, 2)
> assert cos(PI / 2) == 0
> DEG = 2 * PI / 360
> assert sin(45 * DEG) == sqrt(2) / 2
>
> Best regards,
> Adam Bartoš
>
In one sense that is why I
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>
>
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On 6/13/18 7:21 AM, Stephan Houben wrote:
>
>
> Op wo 13 jun. 2018 13:12 schreef Richard Damon
> mailto:rich...@damon-family.org>>:
>
> My first comment is that special casing values like this can lead to
> some very undesirable properties when you use the f
eads as foo = foo + bar, so the first
impression is that it isn't going to mutate, but rebind, but it is
possible that it does an inplace rebind so to me THAT is the case where
I need to dig into the rules to see what it really does. This means that
at quick glance given:
list1 = list
list1 +
equals' is that the definition of it
is hard to come up with. This is especially true for small values. In
particular how small does a number need to be to be ~= 0. You also get
inconsistencies, you can have a ~= b, and b ~= c but not a ~= c. You
can have a + b ~= c but not a ~= c - b
should 0.0
ay as nice precise angles) and then either adjust
the final computation formulas for degrees, or convert the angle to
radians and let the fundamental routine do the small angle computation.
While we are at it, it might be worth thinking if it might make sense to
also define a set of functions using cir
ed.
>
Monotonic (in this sense) just means never changing directions, it can
be increasing and never decreasing or decreasing and never increasing so
we don't need the 'anti-' version.
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> On Jul 14, 2018, at 4:24 AM, Ken Hilton wrote:
>
> Hi all,
>
> Just a curious idea I had. The subject says it all. "import" is currently a
> statement, which means it cannot be used inside anything else. Currently, the
> only way to import a module inside an expression is to use the
> On Jul 24, 2018, at 7:37 AM, Rhodri James wrote:
>
>> On 24/07/18 12:02, David Mertz wrote:
>> Every use I've suggested for the magic proxy is similar to:
>> NullCoalesce(cfg).user.profile.food
>> Yes, the class is magic. That much more so in the library I published last
>> night that
basic support (mostly just for codepoints). It
could make sense to have a Unicode package that knows a lot more of the
complexity of Unicode, doing things like extraction a code point package
that represents a full glyph knowing all the combining rules, and
lly all of the actual implementation of
these prefixes can be handled by setting a flag for the presence of that
prefix, and at the parsing of each character you need to just check a
flag or two to figure out how to process it. You might get a bit more
complication in determining if a given combination is valid, but if that
gets too complicated it is likely an indication of an inconstancy in the
language definition.
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On 4/1/18 4:31 PM, Brendan Barnwell wrote:
> On 2018-04-01 05:36, Steven D'Aprano wrote:
>> On Sun, Apr 01, 2018 at 08:08:41AM -0400, Richard Damon wrote:
>>
>>> One comment about the 'combitorial explosion' is that it sort of
>>> assumes
>>> t
On 4/1/18 8:36 AM, Steven D'Aprano wrote:
> On Sun, Apr 01, 2018 at 08:08:41AM -0400, Richard Damon wrote:
>
>> One comment about the 'combitorial explosion' is that it sort of assumes
>> that each individual combination case needs to be handled with distinct
>>
isk is trivial to make
available for another usage.
Memory just sitting idle is the real waste.
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case where you might get the problem is if you had a control
character (like escape) followed by a digit between 0 and 7, you needed
to expand the escape to 3 digits. This was just one of the traps you
learned to live with (and it seemed that terminal escape codes seemed to
avoid that issue by norm
tter solution would be the creation of a
NAN type (similar to NONE) that implement this sort of property. That
way the feature can be added to integers, rationals, and any other
numeric types that exist (why do just integers need this addition).
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_
in the
headers of the email.
Filtering on Subject does a pretty good job of 'Thread' filtering
You could also filter on In-Reply-To and References to get actual
filtering on threads, but would need to list a lot of message-ids
(especially for In-Reply-To) to block all replys to a long thread.
--
ny of the people in charge think it is
a bad message, they can reject it (first to act wins). Probably need
someone to periodically review the messages that have sit for a bit and
make a decision on them.
Some trusted people can have their moderation status removed, and what
they post goes to the l
ot;string")
except ValueError as e:
print(e)
print("continued on")
j = int(9.0)
i.e. the try block is the program segment that either executes
successful, or your exception routine recovers from the error and sets
things up to continue from there.
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lled, do you return to the next line of that function, or the next
line after the function call?
What happens if the exception happens inside a loop (that is inside the
try)? Do you just go to the next instruction in the loop and continue
looping?
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On 1/7/19 3:38 PM, Barry wrote:
>
>> On 7 Jan 2019, at 03:06, Richard Damon wrote:
>>
>> For something like reading options from a config file, I would use a
>> call that specifies the key and a value to use if the key isn't present,
>> and inside that functio
read gets out of bounds I can enter a message filter to hold for
review any message matching the subject of that thread (or specified
parts of it). While people can get around the filter by changing the
subject line, they can do the same on a forum by starting a new topic.
Someone who intentional
of
the rigors of the language of mathematics. Python on the other hand,
while it allows providing a 'Type Hint' for the type of a variable,
doesn't demand such a thing, so when looking at a piece of code you
don't necessarily know the types of the objects being used (which can
also be a
On 3/16/19 8:14 AM, Dan Sommers wrote:
> On 3/16/19 6:17 AM, Richard Damon wrote:
>> On 3/16/19 4:39 AM, Greg Ewing wrote:
>>> Rémi Lapeyre wrote:
>>>> I think this omit a very important property of
>>>> mathematic equations thought, maths is a v
...
>
That means something VERY different. The first asks if the item is
specifically the True value, while the second just asks if the value is
Truthy, it wold be satisfied also for values like 1.
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ticular objects, and not create a new
object with the same value, so they are Singletons, even if the type
itself isn't
Yes, in many languages the term Singleton is used for Types and not
values, and in part that difference is due to that fact that in Pyt
resents the hardware system), and then after defining that, using
some method to 'run' that hardware. Thus having the above be written as
hardware.x = hardware.y
hardware.y = hardware.x
and then later:
hardware,run()
where the attribute assignment recorded the interconnections and the run
did them
ribed.
(I would suggest that most lists want the subscribed list to be
accessible only by a few trusted individuals to avoid scraping for
spamming.)
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to an assembler programmer, most Function names are
symbolic labels. Yes, you CAN write a call to an absolute (or relative)
memory address, but that is unusual unless you are writing an in memory
patch to an already established program.
Do you really write something like:
call 0x32453
very ofte
> On Aug 18, 2019, at 9:20 AM, Senhaji Rhazi hamza
> wrote:
>
> Hey Steven,
>
> I think there is a way to map x <- [1; + inf] to y <- [0;1] by putting y = 1/x
>
One big issue with using that mapping is it doesn’t preserve many of the
characteristics of the initial distribution. If the x
need to be
treated very differently, or perhaps somehow the prefix needs to
indicate what standard prefix to use to parse the string. Some of your
examples could benefit by sometimes being able to use r' and sometimes
not, so being able to say both r'string're or 'string're could be useful.
--
Richard
the string
> itself.
>
> Another option would be to have a single variant of f-string that,
> instead of creating a string, creates a "string with formatted
> values". That would then be a single object that can be passed around
> as normal, and if conn.execute() received
ple using it in ways you just haven't thought
about, and because you likely can't talk to everyone who will be
affected (they aren't all listening to the same channel) it become
important to work out more of the details so people not as familiar with
what you are proposing can pe
ribute' to that identifier requires major changes in how
that works and also will interfere with a namespace being able to
override how that binding works.
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Martin,
I think one thing you need to realize that just being a better idea
doesn't make it easy to get implemented. There is a LOT of inertia in
infrastructure, and overcoming it can be nearly impossible.
A great example of that is look at your typical keyboard, if you were to
create a new
On 11/11/19 10:10 AM, Random832 wrote:
> On Mon, Nov 11, 2019, at 03:22, Greg Ewing wrote:
>> On 11/11/19, 12:41 PM, Richard Damon wrote:
>>> it was DESIGNED to be inefficient (that was one of its design goals, to
>>> slow typesetters down to be slower than th
Mailman, the manager for the mailing list doesn’t offer any such option. The
closest that could be done is if a topic just goes on too long, a filter could
be added to the list configuration which holds for moderation messages which
match the subject. The problem is that if someone changes the
t that hard to
write and could easily be part of a module to handle that sort of thing.
I also suspect different application domains may have differing 'rules'
of what they want, for example, why do you assume no empty strings?
Also, why just strings, maybe you want to d
e machine
> and an unlimited life span, I’m pretty sure I wouldn’t want to participate in
> those arguments.
My understanding was that the ZWNBS was provide a way to logically
separate two code-points that would otherwise like to bind together for
meaning.
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My one comment about this is to quote from PEP 20, the Zen of Python
There should be one-- and preferably only one --obvious way to do it.
Yes, this does get broken at times with additions to the language, But
this whole proposal to me seems to be an effort to introduce an
alternate way to do
simple recovery (the built in provided by the context
manager). It may be at the cost of making more complex (and explicit)
handling of conditions for current (or possible future) 'eager'
managers. For example, if open doesn't actually open the file, but only
prepares to open, then the use of a file o
> On Nov 20, 2019, at 7:50 AM, Rhodri James wrote:
>
> On 20/11/2019 01:57, Oscar Benjamin wrote:
>>> On Tue, 19 Nov 2019 at 12:03, Paul Moore wrote:
>>>
On Tue, 19 Nov 2019 at 11:34, Oscar Benjamin
wrote:
>>>
If I was to propose anything here it would not be to disallow
:-D :-D ... |-[
> >
> > I nominate this statement for the position of PICT-001 :-)
> >
> > Paul
>
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h
erience, copysign is really only needed for floating point
numbers, and where it is used, efficiency is often at least somewhat
important so adding code to make it work to produce an int result would
slow things down.
For a range step, I find using a ternary operation to be clearer than
using c
). Which means that even if we deprecate loads, the standard
library should continue to use it and not the new load_string for awhile
until it is felt safe that few people are monkey patching in a
load_string member, and we can break the code.
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On 3/5/20 1:27 AM, Greg Ewing wrote:
On 5/03/20 4:08 pm, Richard Damon wrote:
Sometimes I wonder if since Python supports dynamic typing of
results, might not do better by removing the NaN value from Floats
and Decimals, and make the operations that generate the NaN generate
an object
> On Mar 4, 2020, at 10:09 AM, David Mertz wrote:
>
>
> This thread feels very much like a solution looking for a problem.
>
> But on one narrow point, I'm trying to think of everything in the standard
> library or builtins that actually forms a total order with elements of the
> same
that generate the NaN generate an object of a special NaN type.
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On 3/4/20 11:07 PM, Andrew Barnert via Python-ideas wrote:
On Mar 4, 2020, at 19:12, Richard Damon wrote:
Yes, because of the NaN issue, you sort of need an 'Almost Total Order' and
'Really Truly a Total Order', the first allowing the small exception of a very
limited (maybe only one
On 3/5/20 9:10 AM, Steven D'Aprano wrote:
On Thu, Mar 05, 2020 at 08:23:22AM -0500, Richard Damon wrote:
Yes, that is the idea of AlmostTotalOrder, to have algorithms that
really require a total order (like sorting)
Sorting doesn't require a total order. Sorting only requires a weak
order
On 3/5/20 1:37 PM, Andrew Barnert via Python-ideas wrote:
On Mar 5, 2020, at 05:24, Richard Damon wrote:
On 3/4/20 11:07 PM, Andrew Barnert via Python-ideas wrote:
On Mar 4, 2020, at 19:12, Richard Damon wrote:
Yes, because of the NaN issue, you sort of need an 'Almost Total Order
don't want to
hurt that set to add something new. Also, all languages (well, maybe
almost all) are Turing complete, so anything that you can do in one, it
possible in the other, it just might not look pretty or be simple.
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On Jan 31, 2020, at 11:01 AM, Soni L. wrote:
>
> Consider:
>
> x=nameof(foo.bar)
>
> in today's python becomes:
>
> foo.bar
> x="bar"
>
> and when running this you get an AttributeError or something.
>
> the benefit is that "bar" is only typed once, and the attribute access (and
> thus
roblem is statically typed languages, as there we can
determine the type of foo, and see if the change applies (at least in
most cases).
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refactor your code you have a chance that the tool will be able to see
the variable expression foo.bar, and process that like other references
to the item, and thus be able to change it. Just using the string "bar"
would be very hard to see the connection between
e as simple leading zero to indicate octal, it may make sense
to just keep the ambiguous numbers invalid forever. If we admit that the
reasoning is ambiguity, then allowing the single digit numbers could
make sense even if it does mean that writing the rule as a grammar
too.
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signed BinaryInts use their MSB
as the sign bit, and the others as value bits, not to have a separate
sign outside the bits.
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of existing libraries and open
source projects break due to this.
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from a
single type of sequence, (like always a list) and anything that isn't a
list is a terminal (or maybe some other type of structure that would be
iterated differently) so you wouldn't actually be checking for strings,
but for lists (and iterating further on them).
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;x", x) or some similar purpose
function, and in that context, such prints should not normally be long
lived or are part of long term logging in which case the stability of
the label might actually be preferred to not break parsers for the log
output
On 12/31/19 12:49 PM, Andrew Barnert via Python-ideas wrote:
On Dec 31, 2019, at 08:03, Richard Damon wrote:
IF I were to change the syntax ( which I don't propose), I believe the
construct like foo or bar or baz in foobar to give you issues parsing. An
alternative which is, in my opinion
constructor and
implementing its own version of things like in. (not sure if we can
override 'is')
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consistent leading digit, so it isn't omitted, and you
could have subnormal values if the leading digit is 0. The clause on
handling different representations really just apply to those non-binary
formats.
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is set to
include DMARC mitigation to domains with a DMARC of quarantine.
The fact that his domain has a DMARC policy of quarantine says it really
shouldn't be used on a mailing list, but that aspect is commonly ignored
by the service providers.
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n Thu, Dec 26, 2019, 12:27 PM Richard Damon
Note that the statistics module documentation implies the issue,
as median implies that it requires the sequence to be orderable,
and nan isn't orderable. Since the statistics module seems to be
designed to handle types other than floats,
sequence to be orderable, and nan
isn't orderable. Since the statistics module seems to be designed to
handle types other than floats, detecting nan values is extra expensive,
so I think it can be excused for not checking.
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han sorted, as sorted doesn't check if
items are strictly comparable, but just assumes that < provides a total
order, which NaN values breaks. sorted basically can generate an
unsorted result if there are items like NaN that break the assumption.
--
On 12/26/19 2:10 PM, Andrew Barnert via Python-ideas wrote:
On Dec 26, 2019, at 10:58, Richard Damon wrote:
Note, that NaN values are somewhat rare in most programs, I think they can only come
about by explicitly requesting them (like float("nan") ) or perhaps with some
of the mor
powerful packages, like Numpy, so expecting it to handle
this level of nuance is beyond its specification.
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https
, and
everyone who reads Python code now has to keep 6 control flow
statements in their head instead of 5.
AH, like the old conditional COME FROM statement that was proposed for
FORTRAN decades ago.
The anti-pattern suggested to get away from structured code
On 12/29/19 12:20 AM, Brendan Barnwell wrote:
On 2019-12-28 21:11, Richard Damon wrote:
You seem to understand Pure Math, but not the Applied Mathematics of
computers. The Applied Mathematics of Computing is based on the concept
of finite approximation, which is something that Pure Math, like
advanced data structures has less need for this
type of thing, but I suspect that even in Python there are cases where
prefilling with non-existent value could make sense as an optimization,
with an advantage to having all the elements be the same type (so you
wouldn't use None at the value).
-
On 12/29/19 1:16 AM, Christopher Barker wrote:
OMG! Thus is fun and all, but:
On Sat, Dec 28, 2019 at 9:11 PM Richard Damon
mailto:rich...@damon-family.org>> wrote:
... practicality beats purity.
And practically, everyone in this thread understands what a float is,
and what
On 12/29/19 7:05 PM, Christopher Barker wrote:
On Sun, Dec 29, 2019 at 3:26 PM Richard Damon
mailto:rich...@damon-family.org>> wrote:
> Frankly, I’m also confused as to why folks seem to think this is an
> issue to be addressed in the sort() functions
T
sorting -0 before +0 shouldn't be a problem.
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Messag
On 12/29/19 8:13 PM, David Mertz wrote:
On Sun, Dec 29, 2019 at 8:00 PM Richard Damon
mailto:rich...@damon-family.org>> wrote:
Which is EXACTLY the reason I say that if this is important enough to
fix in median, it is important enough to fix in sorted. sorted gives
exactly th
On 12/29/19 5:41 PM, Chris Angelico wrote:
On Mon, Dec 30, 2019 at 9:01 AM Richard Damon wrote:
On 12/29/19 4:30 PM, Chris Angelico wrote:
On Mon, Dec 30, 2019 at 5:48 AM Steven D'Aprano wrote:
On Sat, Dec 28, 2019 at 09:20:49PM -0800, Brendan Barnwell wrote:
Especially since it fails
the number system to some Nan
Number System that includes the NaNs, but in doing that we lose even
more properties. The one issue is that this new invented number system,
being an invented rare bird, can't be assumed when most people say 'Number'.
The proper
eeds to generate SOME answer.
The alternative to having NaN values in the representation would be for
the operations that currently generate it to fault out and either kill
the program or at least generate an exception.
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On 12/29/19 11:00 PM, Tim Peters wrote:
[Richard Damon ]
IEEE total_order puts NaN as bigger than infinity, and -NaN as less than
-inf.
One simple way to implement it is to convert the representaton to a 64
bit signed integer (not its value, but its representation) and if the
sign bit is set
know how hard it is to
get the representation of a float as a 64 bit integer. In C or Assembly
it is fairly easy as you can easily get around the type system, but I
don't know python well enough to do it.
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On 12/29/19 10:39 PM, David Mertz wrote:
On Sun, Dec 29, 2019 at 10:18 PM Richard Damon
mailto:rich...@damon-family.org>> wrote:
IEEE total_order puts NaN as bigger than infinity, and -NaN as
less than -inf.
You mean like this?
>>> def total_order(x):
...
descriptive.
Also GNU isn't Unix, as Unix is a trademarked name for a specific set of
operating systems. GNU produced Linux, which is a mostly work-alike
operating system. Its sort of like saying Scotties isn't a Kleenex (Both
brands of facial tissues).
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the Number line starting with Set Theory doesn't
handle approximation well. In Pure Math, something that is just mostly
true, and can be proved to not always be true, is considered False, but
to applied math, it can be good enough.
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On 12/28/19 10:05 PM, David Mertz wrote:
On Sat, Dec 28, 2019, 9:36 PM Richard Damon <mailto:rich...@damon-family.org>> wrote:
> NaN may be an instance of the abstract type Number, but is isn't
a mathematical number.
Yes, floating point numbers are not pure-math Rea
On 12/28/19 10:41 PM, David Mertz wrote:
On Sat, Dec 28, 2019 at 10:31 PM Richard Damon
mailto:rich...@damon-family.org>> wrote:
Every value of the type float, except NaN and perhaps +inf and -inf
(depending on which version of the Real Number Line you use) IS
ac
On 12/26/19 5:23 PM, Andrew Barnert via Python-ideas wrote:
On Dec 26, 2019, at 12:36, Richard Damon wrote:
On 12/26/19 2:10 PM, Andrew Barnert via Python-ideas wrote:
On Dec 26, 2019, at 10:58, Richard Damon wrote:
Note, that NaN values are somewhat rare in most programs, I think they can
On 12/30/19 12:06 AM, Andrew Barnert wrote:
On Dec 29, 2019, at 20:04, Richard Damon wrote:
Thus your total_order, while not REALLY a total order, is likely good enough
for most purposes.
Well, it is a total order of equivalence classes (with all IEEE-equal values
being equivalent, all
k software
would love ;-)
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rade package that is built with that interpretation
built in. It also likely gives better control over how the values are
computed.
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comparison function fails, and I am not sure if there is a easy solution
to make ALL the Number classes always comparable to each other, one
issue being that what type to do the comparison in most efficiently is
value dependent (magnitude and how close
nverts Garbage In, Crazy Garbage Out to Garbage In, Somewhat
Garbage Out (maybe its abstract art?).
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On 12/30/19 12:45 PM, David Mertz wrote:
On Mon, Dec 30, 2019 at 12:37 PM Richard Damon
mailto:rich...@damon-family.org>> wrote:
My preference is that the interpretation that NaN means Missing Data
isn't appropriate for for the statistics module.
You need to tel the entire
On 12/30/19 4:22 PM, Andrew Barnert via Python-ideas wrote:
On Dec 30, 2019, at 06:50, Richard Damon wrote:
On 12/30/19 12:06 AM, Andrew Barnert wrote:
On Dec 29, 2019, at 20:04, Richard Damon wrote:
Thus your total_order, while not REALLY a total order, is likely good enough
for most
to take care, so the
remaining issues catch you harder.
--
Richard Damon
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