reserve A for QC-alphabet;
reserve p, q, r, s, t for Element of CQC-WFF(A);
reserve X for Subset of CQC-WFF(A);

theorem
  p in TAUT(A) implies (p => q) => q in TAUT(A)
proof
  assume
A1: p in TAUT(A);
  p => ((p => q) => q) in TAUT(A) by Th7;
  hence thesis by A1,CQC_THE1:46;
end;
