reserve L for satisfying_Sh_1 non empty ShefferStr;
reserve L for satisfying_Sheffer_1 satisfying_Sheffer_2 satisfying_Sheffer_3
  non empty ShefferStr;
reserve v,q,p,w,z,y,x for Element of L;

theorem Th110:
  for p,w,q,y holds (((y | y) | y) | q) | ((w | w) | q) = (q | ((
(p | (p | p)) | (p | (p | p))) | w)) | (q | (((p | (p | p)) | (p | (p | p))) |
  w))
proof
  let p,w,q,y;
  (((p | (p | p)) | (p | (p | p))) | (p | (p | p))) = (y | y) | y by Th104;
  hence thesis by Th73;
end;
