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 overcast if and only if Jennifer is bored. For all x_17, x_17 is not sad. For all x_17, x_17 is sad if and only if x_17 is bored.
If it is overcast, then Jennifer is bored can be inferred via the biconditional elimination rule. If Jennifer were bored, then it is overcast can be inferred via the biconditional elimination rule. For all x_17, if x_17 were sad, then x_17 is bored can be inferred via the universal biconditional elimination rule. For all x_17, if x_17 were bored, then x_17 is sad can be inferred via the universal biconditional elimination rule. For all x_17, x_17 is not bored can be inferred via the universal biconditional elimination rule.