def by_distance
import cli@0.2.0.0/cli.bend as Cliimport Base
5747def by_distance(levels: Nat, +d: Nat, +found: List<&2, Scored>) ->
5748 List<&2, String>:
5749 match levels:
5750 case 0n: Nil{}
5751 case 1n+more:
5752 List.append(&2, String, at_distance(found, d),
5753 by_distance(more, (d + 1n : Nat), found))