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use strict;
use warnings;
...

    say sprintf('%s : >%s<', $label, $str);
}

Use of uninitialized value in sprintf at 11130005.pl line 20.
undef : ><
...
        Value "abcde" did not pass type constraint "StrLength[1,4]"
        "StrLength[1,4]" expects length($_) to be between 1 and 4
        length($_) is 5