Consider the following premises. For all x_2, if x_2 were happy, then x_2 is an office clerk. There is at least one x_2 for which if x_2 were an office clerk, then x_2 is taking a plane. For all x_2, if x_2 takes a plane, then x_2 is a police officer. Can we infer the following from them? If we can, name the inference rule being used: For all x_2, the fact that x_2 were happy does not imply that x_2 is a police officer.
That contradicts the premises. Therefore the answer is no.