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use strict;
use warnings;
...

    print "POS #$pos " . ( join ' | ', @charCount ) . "\n";
}

POS #1 a:4
POS #2 q:1 | b:3
...
POS #8 h:4
POS #9 i:4
POS #10 j:4

12 abcdefahij
12 abcdefbhij
12 aqcxefchij
12 abczefdhij