ikegami,

I tried the lexical order method, and it's almost what I need...

On a mac, I get this output: 

FMMNllltuwwxxxz
13AEITfhlllstxx
/39CMMNhhlllllluuwwxxx
8ELMMfhllllxxx
49MMdhllllouxx
2239MMlllquxxxx
018AMMPPQTbbffhllllx
/2559Mllrtuuwwxz

[download]

If I change $seen{$_}++ to $seen{$_}+=2 then I get this: 

/034589BDFFHKMMMNNUXabcfghjllllnqsttuuwwwxxxxyzz
/112334589AACEEGIIKLMNPQRSTTbdeffhhjkllllnopqssttuxxx
//01335899ABCCIMMMNNRTVYbcdefghhhjkllllllloqtuuuwwwxxxxy
/035889BEEFKLLMMMNOPQTabcffghhlllllmqrtuvwxxxx
+/134456899ACGKMMMNOQWbddghhlllllmnooqrtuuwxxx
/2223345899ABDEFGHIMMMNORTabdfhillllnqqtuuwxxxxxyz
+/00113457889AACEIMMMNPPPQQTTZabbbcefffghhlllllmqtuwxx
//2234555899ACGILMMNOQUbehlllmoqrrsttuuuwwwxxyzz

[download]
which DOES list all the chars used, but has duplicates.

In reply to Re^2: Collapsing a string to unique characters by dwhite20899
in thread Collapsing a string to unique characters by dwhite20899

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