ws1s; ex2 X: all2 X1, X2, X3, X4, X5, X6, X7:( (X1 sub X2 & X2 sub X3) => X1 sub X3) & ( (X1 sub X2 & X2 sub X4) => X1 sub X4) & ( (X1 sub X2 & X2 sub X5) => X1 sub X5) & ( (X1 sub X2 & X2 sub X6) => X1 sub X6) & ( (X1 sub X2 & X2 sub X7) => X1 sub X7) & ( (X1 sub X3 & X3 sub X2) => X1 sub X2) & ( (X1 sub X3 & X3 sub X4) => X1 sub X4) & ( (X1 sub X3 & X3 sub X5) => X1 sub X5) & ( (X1 sub X3 & X3 sub X6) => X1 sub X6) & ( (X1 sub X3 & X3 sub X7) => X1 sub X7) & ( (X1 sub X4 & X4 sub X2) => X1 sub X2) & ( (X1 sub X4 & X4 sub X3) => X1 sub X3) & ( (X1 sub X4 & X4 sub X5) => X1 sub X5) & ( (X1 sub X4 & X4 sub X6) => X1 sub X6) & ( (X1 sub X4 & X4 sub X7) => X1 sub X7) & ( (X1 sub X5 & X5 sub X2) => X1 sub X2) & ( (X1 sub X5 & X5 sub X3) => X1 sub X3) & ( (X1 sub X5 & X5 sub X4) => X1 sub X4) & ( (X1 sub X5 & X5 sub X6) => X1 sub X6) & ( (X1 sub X5 & X5 sub X7) => X1 sub X7) & ( (X1 sub X6 & X6 sub X2) => X1 sub X2) & ( (X1 sub X6 & X6 sub X3) => X1 sub X3) & ( (X1 sub X6 & X6 sub X4) => X1 sub X4) & ( (X1 sub X6 & X6 sub X5) => X1 sub X5) & ( (X1 sub X6 & X6 sub X7) => X1 sub X7) & ( (X1 sub X7 & X7 sub X2) => X1 sub X2) & ( (X1 sub X7 & X7 sub X3) => X1 sub X3) & ( (X1 sub X7 & X7 sub X4) => X1 sub X4) & ( (X1 sub X7 & X7 sub X5) => X1 sub X5) & ( (X1 sub X7 & X7 sub X6) => X1 sub X6) & ( (X2 sub X1 & X1 sub X3) => X2 sub X3) & ( (X2 sub X1 & X1 sub X4) => X2 sub X4) & ( (X2 sub X1 & X1 sub X5) => X2 sub X5) & ( (X2 sub X1 & X1 sub X6) => X2 sub X6) & ( (X2 sub X1 & X1 sub X7) => X2 sub X7) & ( (X2 sub X3 & X3 sub X1) => X2 sub X1) & ( (X2 sub X3 & X3 sub X4) => X2 sub X4) & ( (X2 sub X3 & X3 sub X5) => X2 sub X5) & ( (X2 sub X3 & X3 sub X6) => X2 sub X6) & ( (X2 sub X3 & X3 sub X7) => X2 sub X7) & ( (X2 sub X4 & X4 sub X1) => X2 sub X1) & ( (X2 sub X4 & X4 sub X3) => X2 sub X3) & ( (X2 sub X4 & X4 sub X5) => X2 sub X5) & ( (X2 sub X4 & X4 sub X6) => X2 sub X6) & ( (X2 sub X4 & X4 sub X7) => X2 sub X7) & ( (X2 sub X5 & X5 sub X1) => X2 sub X1) & ( (X2 sub X5 & X5 sub X3) => X2 sub X3) & ( (X2 sub X5 & X5 sub X4) => X2 sub X4) & ( (X2 sub X5 & X5 sub X6) => X2 sub X6) & ( (X2 sub X5 & X5 sub X7) => X2 sub X7) & ( (X2 sub X6 & X6 sub X1) => X2 sub X1) & ( (X2 sub X6 & X6 sub X3) => X2 sub X3) & ( (X2 sub X6 & X6 sub X4) => X2 sub X4) & ( (X2 sub X6 & X6 sub X5) => X2 sub X5) & ( (X2 sub X6 & X6 sub X7) => X2 sub X7) & ( (X2 sub X7 & X7 sub X1) => X2 sub X1) & ( (X2 sub X7 & X7 sub X3) => X2 sub X3) & ( (X2 sub X7 & X7 sub X4) => X2 sub X4) & ( (X2 sub X7 & X7 sub X5) => X2 sub X5) & ( (X2 sub X7 & X7 sub X6) => X2 sub X6) & ( (X3 sub X1 & X1 sub X2) => X3 sub X2) & ( (X3 sub X1 & X1 sub X4) => X3 sub X4) & ( (X3 sub X1 & X1 sub X5) => X3 sub X5) & ( (X3 sub X1 & X1 sub X6) => X3 sub X6) & ( (X3 sub X1 & X1 sub X7) => X3 sub X7) & ( (X3 sub X2 & X2 sub X1) => X3 sub X1) & ( (X3 sub X2 & X2 sub X4) => X3 sub X4) & ( (X3 sub X2 & X2 sub X5) => X3 sub X5) & ( (X3 sub X2 & X2 sub X6) => X3 sub X6) & ( (X3 sub X2 & X2 sub X7) => X3 sub X7) & ( (X3 sub X4 & X4 sub X1) => X3 sub X1) & ( (X3 sub X4 & X4 sub X2) => X3 sub X2) & ( (X3 sub X4 & X4 sub X5) => X3 sub X5) & ( (X3 sub X4 & X4 sub X6) => X3 sub X6) & ( (X3 sub X4 & X4 sub X7) => X3 sub X7) & ( (X3 sub X5 & X5 sub X1) => X3 sub X1) & ( (X3 sub X5 & X5 sub X2) => X3 sub X2) & ( (X3 sub X5 & X5 sub X4) => X3 sub X4) & ( (X3 sub X5 & X5 sub X6) => X3 sub X6) & ( (X3 sub X5 & X5 sub X7) => X3 sub X7) & ( (X3 sub X6 & X6 sub X1) => X3 sub X1) & ( (X3 sub X6 & X6 sub X2) => X3 sub X2) & ( (X3 sub X6 & X6 sub X4) => X3 sub X4) & ( (X3 sub X6 & X6 sub X5) => X3 sub X5) & ( (X3 sub X6 & X6 sub X7) => X3 sub X7) & ( (X3 sub X7 & X7 sub X1) => X3 sub X1) & ( (X3 sub X7 & X7 sub X2) => X3 sub X2) & ( (X3 sub X7 & X7 sub X4) => X3 sub X4) & ( (X3 sub X7 & X7 sub X5) => X3 sub X5) & ( (X3 sub X7 & X7 sub X6) => X3 sub X6) & ( (X4 sub X1 & X1 sub X2) => X4 sub X2) & ( (X4 sub X1 & X1 sub X3) => X4 sub X3) & ( (X4 sub X1 & X1 sub X5) => X4 sub X5) & ( (X4 sub X1 & X1 sub X6) => X4 sub X6) & ( (X4 sub X1 & X1 sub X7) => X4 sub X7) & ( (X4 sub X2 & X2 sub X1) => X4 sub X1) & ( (X4 sub X2 & X2 sub X3) => X4 sub X3) & ( (X4 sub X2 & X2 sub X5) => X4 sub X5) & ( (X4 sub X2 & X2 sub X6) => X4 sub X6) & ( (X4 sub X2 & X2 sub X7) => X4 sub X7) & ( (X4 sub X3 & X3 sub X1) => X4 sub X1) & ( (X4 sub X3 & X3 sub X2) => X4 sub X2) & ( (X4 sub X3 & X3 sub X5) => X4 sub X5) & ( (X4 sub X3 & X3 sub X6) => X4 sub X6) & ( (X4 sub X3 & X3 sub X7) => X4 sub X7) & ( (X4 sub X5 & X5 sub X1) => X4 sub X1) & ( (X4 sub X5 & X5 sub X2) => X4 sub X2) & ( (X4 sub X5 & X5 sub X3) => X4 sub X3) & ( (X4 sub X5 & X5 sub X6) => X4 sub X6) & ( (X4 sub X5 & X5 sub X7) => X4 sub X7) & ( (X4 sub X6 & X6 sub X1) => X4 sub X1) & ( (X4 sub X6 & X6 sub X2) => X4 sub X2) & ( (X4 sub X6 & X6 sub X3) => X4 sub X3) & ( (X4 sub X6 & X6 sub X5) => X4 sub X5) & ( (X4 sub X6 & X6 sub X7) => X4 sub X7) & ( (X4 sub X7 & X7 sub X1) => X4 sub X1) & ( (X4 sub X7 & X7 sub X2) => X4 sub X2) & ( (X4 sub X7 & X7 sub X3) => X4 sub X3) & ( (X4 sub X7 & X7 sub X5) => X4 sub X5) & ( (X4 sub X7 & X7 sub X6) => X4 sub X6) & ( (X5 sub X1 & X1 sub X2) => X5 sub X2) & ( (X5 sub X1 & X1 sub X3) => X5 sub X3) & ( (X5 sub X1 & X1 sub X4) => X5 sub X4) & ( (X5 sub X1 & X1 sub X6) => X5 sub X6) & ( (X5 sub X1 & X1 sub X7) => X5 sub X7) & ( (X5 sub X2 & X2 sub X1) => X5 sub X1) & ( (X5 sub X2 & X2 sub X3) => X5 sub X3) & ( (X5 sub X2 & X2 sub X4) => X5 sub X4) & ( (X5 sub X2 & X2 sub X6) => X5 sub X6) & ( (X5 sub X2 & X2 sub X7) => X5 sub X7) & ( (X5 sub X3 & X3 sub X1) => X5 sub X1) & ( (X5 sub X3 & X3 sub X2) => X5 sub X2) & ( (X5 sub X3 & X3 sub X4) => X5 sub X4) & ( (X5 sub X3 & X3 sub X6) => X5 sub X6) & ( (X5 sub X3 & X3 sub X7) => X5 sub X7) & ( (X5 sub X4 & X4 sub X1) => X5 sub X1) & ( (X5 sub X4 & X4 sub X2) => X5 sub X2) & ( (X5 sub X4 & X4 sub X3) => X5 sub X3) & ( (X5 sub X4 & X4 sub X6) => X5 sub X6) & ( (X5 sub X4 & X4 sub X7) => X5 sub X7) & ( (X5 sub X6 & X6 sub X1) => X5 sub X1) & ( (X5 sub X6 & X6 sub X2) => X5 sub X2) & ( (X5 sub X6 & X6 sub X3) => X5 sub X3) & ( (X5 sub X6 & X6 sub X4) => X5 sub X4) & ( (X5 sub X6 & X6 sub X7) => X5 sub X7) & ( (X5 sub X7 & X7 sub X1) => X5 sub X1) & ( (X5 sub X7 & X7 sub X2) => X5 sub X2) & ( (X5 sub X7 & X7 sub X3) => X5 sub X3) & ( (X5 sub X7 & X7 sub X4) => X5 sub X4) & ( (X5 sub X7 & X7 sub X6) => X5 sub X6) & ( (X6 sub X1 & X1 sub X2) => X6 sub X2) & ( (X6 sub X1 & X1 sub X3) => X6 sub X3) & ( (X6 sub X1 & X1 sub X4) => X6 sub X4) & ( (X6 sub X1 & X1 sub X5) => X6 sub X5) & ( (X6 sub X1 & X1 sub X7) => X6 sub X7) & ( (X6 sub X2 & X2 sub X1) => X6 sub X1) & ( (X6 sub X2 & X2 sub X3) => X6 sub X3) & ( (X6 sub X2 & X2 sub X4) => X6 sub X4) & ( (X6 sub X2 & X2 sub X5) => X6 sub X5) & ( (X6 sub X2 & X2 sub X7) => X6 sub X7) & ( (X6 sub X3 & X3 sub X1) => X6 sub X1) & ( (X6 sub X3 & X3 sub X2) => X6 sub X2) & ( (X6 sub X3 & X3 sub X4) => X6 sub X4) & ( (X6 sub X3 & X3 sub X5) => X6 sub X5) & ( (X6 sub X3 & X3 sub X7) => X6 sub X7) & ( (X6 sub X4 & X4 sub X1) => X6 sub X1) & ( (X6 sub X4 & X4 sub X2) => X6 sub X2) & ( (X6 sub X4 & X4 sub X3) => X6 sub X3) & ( (X6 sub X4 & X4 sub X5) => X6 sub X5) & ( (X6 sub X4 & X4 sub X7) => X6 sub X7) & ( (X6 sub X5 & X5 sub X1) => X6 sub X1) & ( (X6 sub X5 & X5 sub X2) => X6 sub X2) & ( (X6 sub X5 & X5 sub X3) => X6 sub X3) & ( (X6 sub X5 & X5 sub X4) => X6 sub X4) & ( (X6 sub X5 & X5 sub X7) => X6 sub X7) & ( (X6 sub X7 & X7 sub X1) => X6 sub X1) & ( (X6 sub X7 & X7 sub X2) => X6 sub X2) & ( (X6 sub X7 & X7 sub X3) => X6 sub X3) & ( (X6 sub X7 & X7 sub X4) => X6 sub X4) & ( (X6 sub X7 & X7 sub X5) => X6 sub X5) & ( (X7 sub X1 & X1 sub X2) => X7 sub X2) & ( (X7 sub X1 & X1 sub X3) => X7 sub X3) & ( (X7 sub X1 & X1 sub X4) => X7 sub X4) & ( (X7 sub X1 & X1 sub X5) => X7 sub X5) & ( (X7 sub X1 & X1 sub X6) => X7 sub X6) & ( (X7 sub X2 & X2 sub X1) => X7 sub X1) & ( (X7 sub X2 & X2 sub X3) => X7 sub X3) & ( (X7 sub X2 & X2 sub X4) => X7 sub X4) & ( (X7 sub X2 & X2 sub X5) => X7 sub X5) & ( (X7 sub X2 & X2 sub X6) => X7 sub X6) & ( (X7 sub X3 & X3 sub X1) => X7 sub X1) & ( (X7 sub X3 & X3 sub X2) => X7 sub X2) & ( (X7 sub X3 & X3 sub X4) => X7 sub X4) & ( (X7 sub X3 & X3 sub X5) => X7 sub X5) & ( (X7 sub X3 & X3 sub X6) => X7 sub X6) & ( (X7 sub X4 & X4 sub X1) => X7 sub X1) & ( (X7 sub X4 & X4 sub X2) => X7 sub X2) & ( (X7 sub X4 & X4 sub X3) => X7 sub X3) & ( (X7 sub X4 & X4 sub X5) => X7 sub X5) & ( (X7 sub X4 & X4 sub X6) => X7 sub X6) & ( (X7 sub X5 & X5 sub X1) => X7 sub X1) & ( (X7 sub X5 & X5 sub X2) => X7 sub X2) & ( (X7 sub X5 & X5 sub X3) => X7 sub X3) & ( (X7 sub X5 & X5 sub X4) => X7 sub X4) & ( (X7 sub X5 & X5 sub X6) => X7 sub X6) & ( (X7 sub X6 & X6 sub X1) => X7 sub X1) & ( (X7 sub X6 & X6 sub X2) => X7 sub X2) & ( (X7 sub X6 & X6 sub X3) => X7 sub X3) & ( (X7 sub X6 & X6 sub X4) => X7 sub X4) & ( (X7 sub X6 & X6 sub X5) => X7 sub X5) & X1 sub X & X2 sub X & X3 sub X & X4 sub X & X5 sub X & X6 sub X & X7 sub X;