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#!/usr/bin/perl
use strict;
use warnings;
...
        print unless grep $seen{$_}++, split /\s+\+\s+/;
    }
}

#!/usr/bin/perl
use strict;
use warnings;
...
d_83_1_1- + c_2_1_5-d_162_1_1-
c_2_1_2- + a_123_1_1-
a_123_1_1- + c_2_1_2-