What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Linda is not playing squash. Thomas is a nurse if and only if John is rich. Thomas is a nurse if and only if Linda is playing squash. For all x_7, x_7 is rich if and only if x_7 is a mechanic.
If Thomas were a nurse, then John is rich. If Thomas were a nurse, then Linda is playing squash. If John were rich, then Thomas is a nurse. If Linda plays squash, then Thomas is a nurse. Thomas is not a nurse. For all x_7, if x_7 were rich, then x_7 is a mechanic. For all x_7, if x_7 were a mechanic, then x_7 is rich.