What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_3, if x_3 writes a letter, then x_3 is a sailor. For all x_3, x_3 will cook. There is at least one x_3 for which x_3 will write a letter.
There is at least one x_3 for which x_3 is a sailor. There is at least one x_3 for which x_3 will write a letter and x_3 will cook. There is at least one x_3 for which x_3 will cook and x_3 will write a letter.