def grp
import bend-kit-sigv4@0.11.0.1/sigv4.bend as Sigv4import Base
224def grp(xs: List<&2, Sigma<&2, &2, String, _ => String>>, acc: List<&2, Sigma<&2, &2, String, _ => String>>) -> List<&2, Sigma<&2, &2, String, _ => String>>:
225 match xs:
226 case Nil{}:
227 List.reverse(&2, Sigma<&2, &2, String, _ => String>, acc)
228 case Con{(+n, +v), t}:
229 grp(t, grp.add(acc, n, v))