def unavailable
import bend-kit-router@0.2.0.0/router.bend as Routerimport Base
444def unavailable(xs: List<&2, String>, +present: List<&2, String>) -> List<&2, String>:
445 match xs:
446 case Nil{}:
447 Nil{}
448 case +h <> t:
449 unavailable.prepend(Bool.not(member(present, h)), h, unavailable(t, present))