| (max(x0) < a ⊃ a;max(x0)) = a, a < max(x1), ordered≤(x0), x1 ⊑ x0 ⊦ max(x1) = a, x0 = [], x1 = [] |
a = a, a < max(x1), max(x0) < a, ordered≤(x0), x1 ⊑ x0 ⊦ max(x1) = a, x0 = [], x1 = []
max(x0) = a, a < max(x1), ordered≤(x0), x1 ⊑ x0 ⊦ max(x1) = a, x0 = [], x1 = [], max(x0) < a