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, x_10 is rich if and only if x_10 is a sailor. There is at least one x_10 for which x_10 is not rich. For all x_10, if x_10 works, then x_10 is a sailor. For all x_10, if x_10 plays squash, then x_10 is working.
For all x_10, if x_10 plays squash, then x_10 is a sailor. For all x_10, if x_10 were rich, then x_10 is a sailor. For all x_10, if x_10 were a sailor, then x_10 is rich. There is at least one x_10 for which x_10 is not a sailor.