def bond_cov_pair
import bend-prot@0.1.0.0/bonded.bend as Bondedimport Base
import bend-prot@0.1.0.0/protein.bend as P
79def bond_cov_pair(+xs: List<&2, P.Atom>, s1: U32, s2: U32, +k: F32) -> F32:
80 bond_cov_look(atom_of_serial(xs, s1), atom_of_serial(xs, s2), k)