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, if x_10 were an office clerk, then x_10 is taking a plane. For all x_10, if x_10 takes a plane, then x_10 is writing a letter. There is at least one x_10 for which x_10 will not write a letter. For all x_10, x_10 is an office clerk or x_10 is a musician.
There is at least one x_10 for which x_10 will not take a plane. For all x_10, if x_10 were an office clerk, then x_10 is writing a letter.