PROOF.oc.masked: def of bend-osdev-mode-core@0.1.0.0
Import: import bend-osdev-mode-core@0.1.0.0/PROOF.bend as PROOF
Lines 499-501 of bend-osdev-mode-core@0.1.0.0/PROOF.bend: https://jend.leeeet.dev/read.txt?path=bend-osdev-mode-core@0.1.0.0/PROOF.bend&start_line=499&end_line=501

import Base
import bend-osdev-bytes@0.1.1.0/bytes.bend as B
import bend-osdev-bytes@0.1.1.0/LAWS.bend as BL

# Every Octets is masked: to_list(o) = to_list(of_list(to_list(o))) = mask(to_list(o))
def oc.masked(+o: B.Octets) -> {B.mask(B.Octets.to_list(o)) == B.Octets.to_list(o) : List<&2, U32>}:
  Equal.trans(List<&2, U32>, B.mask(B.Octets.to_list(o)), B.Octets.to_list(B.Octets.of_list(B.Octets.to_list(o))), B.Octets.to_list(o), Equal.sym(List<&2, U32>, B.Octets.to_list(B.Octets.of_list(B.Octets.to_list(o))), B.mask(B.Octets.to_list(o)), BL.octets_to_of(B.Octets.to_list(o))), Equal.cong(B.Octets, List<&2, U32>, x => B.Octets.to_list(x), B.Octets.of_list(B.Octets.to_list(o)), o, BL.octets_of_to(o)))

Uses (11):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Equal.cong
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Equal.sym
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Equal.trans
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.0/LAWS.bend&name=octets_of_to
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.0/LAWS.bend&name=octets_to_of
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.0/bytes.bend&name=Octets
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.0/bytes.bend&name=Octets.of_list
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.0/bytes.bend&name=Octets.to_list
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.0/bytes.bend&name=mask