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use strict;
use warnings;
...
}

print "$diff_str1\n$diff_str2\n";

Perlmonks is the best [perl] [community]
Perlmonks is <one> <of> the best [community] <of> [perl] <users>

$str1 = 'Perlmonks is the best perl perl community';
$str2 = 'Perlmonks is one of the best community of perl users';
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Perlmonks is the best [perl] <perl> [community]
Perlmonks is <one> <of> the best [community] <of> [perl] <users>