What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Mary is not a poet. For all x_13, x_13 is a poet if and only if x_13 will write a letter. It is cloudy.
Mary is not a poet and it is cloudy. It is cloudy and Mary is not a poet. For all x_13, if x_13 were a poet, then x_13 is writing a letter. For all x_13, if x_13 writes a letter, then x_13 is a poet.