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: William is making tea if and only if Linda is climbing a mountain. William is making tea if and only if Robert is running. Robert is not running. Linda is climbing a mountain if and only if Michael is a server.
If William makes tea, then Linda is climbing a mountain can be inferred via the biconditional elimination rule. If William makes tea, then Robert is running can be inferred via the biconditional elimination rule. If Linda climbs a mountain, then Michael is a server can be inferred via the biconditional elimination rule. If Linda climbs a mountain, then William is making tea can be inferred via the biconditional elimination rule. If Robert goes running, then William is making tea can be inferred via the biconditional elimination rule. If Michael were a server, then Linda is climbing a mountain can be inferred via the biconditional elimination rule. William is not making tea can be inferred via the biconditional elimination rule.