What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: Charles is a writer if and only if Jennifer is an office clerk. Jennifer is an office clerk if and only if James is playing squash. Charles is not a writer. It is cold if and only if James is playing squash.
If Charles were a writer, then Jennifer is an office clerk can be inferred via the biconditional elimination rule. If Jennifer were an office clerk, then James is playing squash can be inferred via the biconditional elimination rule. If it is cold, then James is playing squash can be inferred via the biconditional elimination rule. If Jennifer were an office clerk, then Charles is a writer can be inferred via the biconditional elimination rule. If James plays squash, then Jennifer is an office clerk can be inferred via the biconditional elimination rule. If James plays squash, then it is cold can be inferred via the biconditional elimination rule. Jennifer is not an office clerk can be inferred via the biconditional elimination rule.