With Hypothetical Syllogism, we have two cited lines, each of which is
supposed to be a conditional. Let's call them A and B. There are two cases:
Either the second operand of A matches the first operand of B, and the second
operand of B matches the second operand of the target, and the first operand
of A matches the first operand of the target. Or: The same with A and B
reversed.
(i) p -> q; (ii) q -> r; (iii) p -> r;
With Hypothetical Syllogism, we have two cited lines, each of which is supposed to be a conditional. Let's call them A and B. There are two cases: Either the second operand of A matches the first operand of B, and the second operand of B matches the second operand of the target, and the first operand of A matches the first operand of the target. Or: The same with A and B reversed.
Here, we simply enumerate through these cases.