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 Th114:
  for q,p,y holds (((y | y) | y) | p) | ((q | q) | p) = (p | ((p
  | p) | q)) | (p | ((p | p) | q))
proof
  let q,p,y;
  p | p = ((y | y) | y) | p by Th101;
  hence thesis by Th74;
end;
