Consider the following premises. Barbara is not playing squash. Barbara is playing squash if and only if Jessica is playing tennis. Richard is not a poet. If Jessica takes a plane, then Richard is a poet. Can we infer the following from them? If we can, name the inference rule being used: Jessica is playing tennis.
 From the fact that if Jessica takes a plane, then Richard is a poet, and that Richard is not a poet we can infer that Jessica is not taking a plane via modus tollens. Finally, from the fact that Barbara is playing squash if and only if Jessica is playing tennis, and that Barbara is not playing squash we can infer that Jessica is not playing tennis via biconditional elimination, which contradicts that Jessica is playing tennis. Therefore, the answer is no.