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: It is sunny or Jennifer is a soldier. If Jennifer were a soldier, then William is playing tennis. Karen is playing squash if and only if William is playing tennis. If it is sunny, then William is playing tennis.
William is playing tennis can be inferred via the disjunction elimination rule. If Karen plays squash, then William is playing tennis can be inferred via the biconditional elimination rule. If William plays tennis, then Karen is playing squash can be inferred via the biconditional elimination rule.