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 Th140:
  for z,p,q,y,x holds ((((x | (y | (y | y))) | q) | ((z | z) | q)
) | ((q | (x | z)) | (q | (x | z)))) = ((((z | z) | (p | (p | p))) | ((x | (y |
  (y | y))) | q)) | ((q | q) | ((x | (y | (y | y))) | q)))
proof
  let z,p,q,y,x;
  (((x | (y | (y | y))) | q) | ((z | z) | q)) = ((q | (x | z)) | (q | (x |
  z))) by Th73;
  hence thesis by Th73;
end;
