What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_8, if x_8 writes a letter, then x_8 is not fast. For all x_8, x_8 is fast. For all x_8, x_8 will work if and only if x_8 will write a letter. For all x_8, if x_8 writes a letter, then x_8 is working.
For all x_8, x_8 will not write a letter. For all x_8, if x_8 works, then x_8 is writing a letter. For all x_8, if x_8 writes a letter, then x_8 is working.