def pick_member.by.rows
import unified-nsga-iii@0.2.2.0/survival.bend as Survivalimport Base
628def pick_member.by.rows(group: List<&2, NRow>, empty_niche: Bool, +fallback: Nat) -> Nat:
629 match group:
630 case Nil{}:
631 fallback
632 case g0 <> gs:
633 pick_member.by.ne.rows({g0 <> gs : List<&2, NRow>}, empty_niche)