Reverse the earlier arrangement: “If the number is even or odd, it is a number.”
Antecedent: “It is even or odd” — disjunctive.
Consequent: “It is a number” — categorical.
An entire “or” proposition now serves as the supposed condition and a categorical assertion as the consequent. This is the disjunctive → categorical structural pattern.
Reversing the sides need not preserve truth; the present task is to recognize their form and placement, not to assume that all reversals yield valid inferences.