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./pairs | grep cut | cut -d " " -f 4- | sort -u | sort -nr -k3
cluster,items,attr 0 3 2 apple,orange,pumpkin plant,round
...
cluster,items,attr 1 1 3 ball red,round,toy
cluster,items,attr 0 1 4 orange fruit,orange,plant,round
cluster,items,attr 0 1 4 apple fruit,plant,red,round

use List::Util (sum);
use List::MoreUtils qw(uniq);
...
}