for Al being QC-alphabet
for x being bound_QC-variable of Al
for S being Element of CQC-Sub-WFF Al
for xSQ being second_Q_comp of [S,x] st [S,x] is quantifiable holds
@ ((CQCSub_All ([S,x],xSQ)) `2) = ((@ (RestrictSub (x,(All (x,(S `1))),xSQ))) +* ((@ xSQ) | (RSub1 (All (x,(S `1)))))) +* ((@ xSQ) | (RSub2 ((All (x,(S `1))),xSQ)))