Perm.AaBits.minus: def of bend-osdev-apparmor@0.1.0.0
Import: import bend-osdev-apparmor@0.1.0.0/perm.bend as Perm
Lines 23-31 of bend-osdev-apparmor@0.1.0.0/perm.bend: https://jend.leeeet.dev/read.txt?path=bend-osdev-apparmor@0.1.0.0/perm.bend&start_line=23&end_line=31

import Base

# a without b
def AaBits.minus(a: List<&2, Bool>, b: List<&2, Bool>) -> List<&2, Bool>:
  match a b:
    case Nil{} _:
      Nil{}
    case Con{x, xs} Nil{}:
      Con{x, xs}
    case Con{x, xs} Con{y, ys}:
      Con{Bool.and(x, Bool.not(y)), AaBits.minus(xs, ys)}

Uses (4):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.and
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.not
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List