What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_6, x_6 will not write a letter or x_6 is fast. For all x_6, if x_6 were a sailor, then x_6 is a janitor. There is at least one x_6 for which x_6 will write a letter or x_6 is a sailor. For all x_6, x_6 is fast if and only if x_6 is a janitor.
There is at least one x_6 for which x_6 is a sailor or x_6 is fast. For all x_6, if x_6 were fast, then x_6 is a janitor. For all x_6, if x_6 were a janitor, then x_6 is fast.