Sim.pairs_of_flat: def of bend-prot@0.1.0.0
Import: import bend-prot@0.1.0.0/sim.bend as Sim
Lines 254-262 of bend-prot@0.1.0.0/sim.bend: https://jend.leeeet.dev/read.txt?path=bend-prot@0.1.0.0/sim.bend&start_line=254&end_line=262

import Base

# Flat bonds back to pairs for the pair-list energies.
def pairs_of_flat(bs: List<&2, U32>) -> List<&1, U32 & U32>:
  match bs:
    case Nil{}:
      Nil{}
    case x <> Nil{}:
      Nil{}
    case x <> y <> t:
      (x, y) <> pairs_of_flat(t)

Uses (4):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Sigma
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32