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#!/usr/bin/env perl -l

...
AABBB
ABBBB
BBBBB

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'AAA' found at end of 'AAAAA'
'AAA' found before (but not at) end of 'AAAAB'
...
'AAA' not found in 'AABBB'
'AAA' not found in 'ABBBB'
'AAA' not found in 'BBBBB'