> By the way, are there derived conjunctions whose
> derivations do not, ultimately, resort to (2 :)?

5!:0 and `: 6 can produce conjunctions too.  I can't
think of a way to produce a non-trivial case without
using 2 :, though.

   y =. &
   ay =. 5!:1 <'y'
   ay `: 6
&
   ay 5!:0
&
   5 (ay `: 6) +
5&+
   5 (ay `: 6) + 10
15

The AR operand to 5!:0 and `: 6 is a noun and can be created
by any means, not necessarily 5!:1.

   ad =. < (,':') ,&< ((,'0');2) ,&< (,'0');2 1 $' &'
   ad
+-----------------+
|+-+-------------+|
||:|+-----+-----+||
|| ||+-+-+|+-+-+|||
|| |||0|2|||0| ||||
|| ||+-+-+|| |&||||
|| ||     |+-+-+|||
|| |+-----+-----+||
|+-+-------------+|
+-----------------+
   ad `: 6
+-+-+-+
|2|:| |
| | |&|
+-+-+-+
2 : 0

&
)
   + (ad `: 6) -
+-+
|&|
+-+
&

Henry Rich


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