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use strict;
use warnings;
...
    next if (not defined $array_of_hashes[0]{opt}{$step_number});
    say $step_number . " = " . $array_of_hashes[0]{opt}{$step_number};
+    
    }

step003 = 0
step013 = 0
...
step715 = 0
step800 = 5
step820 = 0