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: For all x_12, x_12 will play a game. For all x_12, x_12 will make tea. If Elisabeth plays a game, then Barbara is climbing a mountain.
For all x_12, x_12 will play a game and x_12 will make tea can be inferred via the universal conjunction rule. For all x_12, x_12 will make tea and x_12 will play a game can be inferred via the universal conjunction rule.