What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_13, if x_13 plays squash, then x_13 is a lawyer. For all x_13, x_13 will not cook. There is at least one x_13 for which if x_13 were fast, then x_13 is cooking. For all x_13, if x_13 were a lawyer, then x_13 is writing a letter. For all x_13, x_13 will write a letter if and only if x_13 is fast.
There is at least one x_13 for which x_13 is not fast. For all x_13, if x_13 plays squash, then x_13 is writing a letter. For all x_13, if x_13 writes a letter, then x_13 is fast. For all x_13, if x_13 were fast, then x_13 is writing a letter.