Hi,
the following runs in 105 msec on my old G3 300 Mhz Mac,
and must be pretty fast on the latest machines...
It finds 442 duplicates.
JB
on mouseUp
set cursor to watch
lock screen
put fld 1 into a -- fld 1 contains the 8708 lines of your list
put "" into T
put the milliseconds into m
repeat for each line j in a
add 1 to T[j]
end repeat
put "" into a
repeat for each line j in the keys of T
if T[j] > 1 then
put j & cr after a
end if
end repeat
put the milliseconds - m &cr&cr& a
end mouseUp
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