Normalization.keep_in: def of unified-nsga-iii@0.2.2.0
Import: import unified-nsga-iii@0.2.2.0/normalization.bend as Normalization
Lines 568-569 of unified-nsga-iii@0.2.2.0/normalization.bend: https://jend.leeeet.dev/read.txt?path=unified-nsga-iii@0.2.2.0/normalization.bend&start_line=568&end_line=569

import Base

def keep_in(idxs: List<&2, Nat>, +pool: List<&2, Nat>) -> List<&2, Nat>:
  keep_in.go(idxs, pool)

Uses (3):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=unified-nsga-iii@0.2.2.0/normalization.bend&name=keep_in.go