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 snowing if and only if Thomas is a scientist. Sarah is drinking water if and only if it is snowing. Sarah is drinking water if and only if Jennifer is fast. Jennifer is not fast.
If it snows, then Thomas is a scientist can be inferred via the biconditional elimination rule. If Sarah drinks water, then it is snowing can be inferred via the biconditional elimination rule. If Sarah drinks water, then Jennifer is fast can be inferred via the biconditional elimination rule. If Thomas were a scientist, then it is snowing can be inferred via the biconditional elimination rule. If it snows, then Sarah is drinking water can be inferred via the biconditional elimination rule. If Jennifer were fast, then Sarah is drinking water can be inferred via the biconditional elimination rule. Sarah is not drinking water can be inferred via the biconditional elimination rule.