What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Mary plays squash, then John is writing a letter. For all x_7, x_7 will write a letter if and only if x_7 is a poet. Mary is playing squash or John is a poet.
If John were a politician, then Mary is playing squash. For all x_7, if x_7 writes a letter, then x_7 is a poet. For all x_7, if x_7 were a poet, then x_7 is writing a letter.