(x1 ≡ y1) → (x2 ≡ y2) = 1 (x2 ≡ y2) → (x3 ≡ y3) = 1 (x3 ≡ y3) → (x4 ≡ y4) = 1 (x4 ≡ y4) → (x5 ≡ y5) = 1
(x1 → y1) → (x2 ≡ y2) = 1 (x2 → y2) → (x3 ≡ y3) = 1 (x3 → y3) → (x4 ≡ y4) = 1
(x1 ∨ y1) → (x2 ≡ y2) = 1 (x2 ∨ y2) → (x3 ≡ y3) = 1 (x3 ∨ y3) → (x4 ≡ y4) = 1 (x4 ∨ y4) → (x5 ≡ y5) = 1
(x1 ∧ x2) → (x3 ∨ x4) = 1 (x3 ∧ x4) → (x5 ∨ x6) = 1 (x5 ∧ x6) → (x7 ∨ x8) = 1 (x7 ∧ x8) → (x9 ∨ x10) = 1
(x1 ∧ x2) → (x3 ∧ x4) = 1 (x3 ∧ x4) → (x5 ∧ x6) = 1 (x5 ∧ x6) → (x7 ∧ x8) = 1 (x7 ∧ x8) → (x9 ∧ x10) = 1
(x1 ∧ x2) → (x3 → x4) = 1 (x3 ∧ x4) → (x5 → x6) = 1 (x5 ∧ x6) → (x7 → x8) = 1 (x7 ∧ x8) → (x9 → x10) = 1
(x1 ∨ x2) → (x3 ∧ x4) = 1 (x3 ∨ x4) → (x5 ∧ x6) = 1 (x5 ∨ x6) → (x7 ∧ x8) = 1
(x1 ∨ x2) → (x3 ∧ x4) = 1 (x3 ∨ x4) → (x5 ∧ x6) = 1 (x5 ∨ x6) → (x7 ∧ x8) = 1 (x7 ∨ x8) → (x9 ∧ x10) = 1
(x1 ∨ x2) → (x3 → x4) = 1 (x3 ∨ x4) → (x5 → x6) = 1 (x5 ∨ x6) → (x7 → x8) = 1
(x1 ∨ x2) → (x3 → x4) = 1 (x3 ∨ x4) → (x5 → x6) = 1 (x5 ∨ x6) → (x7 → x8) = 1 (x7 ∨ x8) → (x9 → x10) = 1