What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_10, x_10 is a sailor if and only if x_10 is a poet. For all x_10, x_10 is a sailor. There is at least one x_10 for which x_10 is happy if and only if x_10 is a poet.
For all x_10, if x_10 were a sailor, then x_10 is a poet. There is at least one x_10 for which if x_10 were happy, then x_10 is a poet. For all x_10, if x_10 were a poet, then x_10 is a sailor. There is at least one x_10 for which if x_10 were a poet, then x_10 is happy.