def pk.zip
import emerging-ezaudio@0.4.0.0/src/mp3_enc.bend as Mp3Encimport Base
1386def pk.zip(ls: List<&2, Gr>, rs: List<&2, Gr>, acc: List<&2, Gr>) -> List<&2, Gr>:
1387 match ls rs:
1388 case +l <> lt +r <> rt:
1389 pk.zip(lt, rt, r <> l <> acc)
1390 case _ _:
1391 List.reverse(&2, Gr, acc)