def minus
import unified-nsga-iii@0.2.2.0/util.bend as Utilimport Base
87def minus(+xs: List<&2, Nat>, +ys: List<&2, Nat>) -> List<&2, Nat>:
88 match xs:
89 case Nil{}:
90 Nil{}
91 case h <> t:
92 minus.put(h, minus(t, ys), in_nats(h, ys))