Topology.count_below: def of bend-prot@0.1.0.0
Import: import bend-prot@0.1.0.0/topology.bend as Topology
Lines 21-26 of bend-prot@0.1.0.0/topology.bend: https://jend.leeeet.dev/read.txt?path=bend-prot@0.1.0.0/topology.bend&start_line=21&end_line=26

import Base
import bend-prot@0.1.0.0/geom.bend as G
import bend-prot@0.1.0.0/protein.bend as P

def count_below(xs: List<&2, P.Atom>, +qp: G.Vec3, +c2: F32) -> Nat:
  match xs:
    case Nil{}:
      0n
    case h <> t:
      Nat.add(count_below(t, qp, c2), head_hit_nat(h, qp, c2))

Uses (7):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=F32
  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=Base/base.bend&name=Nat.add
  https://jend.leeeet.dev/definition.txt?path=bend-prot@0.1.0.0/geom.bend&name=Vec3
  https://jend.leeeet.dev/definition.txt?path=bend-prot@0.1.0.0/protein.bend&name=Atom
  https://jend.leeeet.dev/definition.txt?path=bend-prot@0.1.0.0/topology.bend&name=head_hit_nat