Identify the common pattern of deductive reasoning in the following argument: If we don't stop for gas soon then we will run out of gas. If we run out of gas, then we will be late for the wedding. Therefore, if we don't stop for gas soon we will be late for the wedding.

The pattern is a chain (pure hypothetical) argument that links conditionals into one.

If we do not stop for gas then we run out, and if we run out then we are late.

The consequent of the first conditional is the antecedent of the second.

Linking them yields if we do not stop for gas then we are late, dropping the shared middle.

Chaining conditionals through a common link is the pure hypothetical syllogism.