theorem Th92:
  for A being connected transitive RelStr, B being finite Subset of A holds
    ex s being FinSequence of A st s is B-desc_ordering
proof
  let A be connected transitive RelStr, B be finite Subset of A;
  consider s being FinSequence of A such that A1: s is B-asc_ordering by Th91;
  take Rev s;
  thus thesis by A1, Th75;
end;
