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$ perl -MO=Deparse -ane '$s = ""; foreach (@F) { /(\d+)-(\d+)/ and $2 
+- $1 >= 30 and $s .= " $1-$2" } print "$F[0]$s\n" if $s'

...
    }
    print "$F[0]$s\n" if $s;
}

#!/usr/bin/env perl
use warnings;
...
    }
    print "$fields[0]$s\n" if $s;
}