Consider the following premises. For all x_19, if x_19 were happy, then x_19 is poor. For all x_19, if x_19 were an office clerk, then x_19 is a soldier. For all x_19, x_19 is happy or x_19 is not a taxi driver. There is at least one x_19 for which x_19 is an office clerk if and only if x_19 is poor. Can we infer the following from them? If we can, name the inference rule being used: For all x_19, the fact that x_19 were a taxi driver does not imply that x_19 is a soldier.
That contradicts the premises. Therefore the answer is no.