anchor.diff:          fun({FileGuid, FileRequiredPerms}, {BasePermsPerFileAcc, RequiredPermsAcc}) ->
               {
                   BasePermsPerFileAcc#{FileGuid => complementary_perms(FileRequiredPerms)},
  -                    [{FileGuid, Perm} || Perm <- FileRequiredPerms] ++ RequiredPermsAcc
  +                [{FileGuid, Perm} || Perm <- FileRequiredPerms] ++ RequiredPermsAcc
               }
           end,
           {#{}, []},
  
positive.code: %%%===================================================================
  %%% POSIX TESTS MECHANISM
  %%%===================================================================
  
  
  %%%===================================================================
  
negative.code:     ?write_acl,
      ?write_owner
  ]).
  -define(ALL_POSIX_PERMS, [read, write, exec]).
  
  
  -define(ALLOW_ACE(__IDENTIFIER, __FLAGS, __MASK), #access_control_entity{
  