def flatten_chains_residues
import bend-prot@0.1.0.0/protein.bend as Proteinimport Base
177def flatten_chains_residues(xs: List<&2, Chain>) -> List<&2, Residue>:
178 match xs:
179 case Nil{}:
180 Nil{}
181 case h <> t:
182 flatten_chains_extend(h, flatten_chains_residues(t))