Consider the following premises. There is at least one y for which if y works, then y is a carpenter. For all y, if y climbs a mountain, then y is working. For all y, if y were an office clerk, then y is climbing a mountain. For all y, if y were a carpenter, then y is an office clerk. Can we infer the following from them? If we can, name the inference rule being used: For all y, the fact that y climbs a mountain does not imply that y is a carpenter.
That contradicts the premises. Therefore the answer is no.