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    print $name."\n";
    print $letters."\n";
    print $masks{$_}."\n";

which gives obvious error:
A
W       W       M       W       W       W       M
Use of uninitialized value $_ in hash element at ./parse-counts.pl lin
+e 37, <INPUTR> line 2.
Use of uninitialized value within %masks in concatenation (.) or strin
+g at ./parse-counts.pl line 37, <INPUTR> line 2.