for A being QC-alphabet
for X being Subset of (CQC-WFF A)
for p, q being Element of CQC-WFF A
for x being bound_QC-variable of A st not x in still_not-bound_in p holds
X |- (All (x,(p => q))) => (p => (All (x,q))) by Th74, CQC_THE1:59;