Topology.contacts_of_head: def of bend-prot@0.1.0.0
Import: import bend-prot@0.1.0.0/topology.bend as Topology
Lines 85-88 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=85&end_line=88

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

def contacts_of_head(h: P.Atom, +ys: List<&2, P.Atom>, +c2: F32) -> Nat:
  match h:
    case P.Atom{serial, elem, +pos}:
      count_below(ys, pos, c2)

Uses (5):
  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=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=count_below