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_11, if x_11 plays a game, then x_11 is making tea. For all x_11, x_11 is not curious or x_11 will play a game. For all x_11, if x_11 works, then x_11 is making tea. For all x_11, x_11 is curious or x_11 will work. There is at least one x_11 for which x_11 is fast. For all x_11, if x_11 makes tea, then x_11 is working.
For all x_11, if x_11 plays a game, then x_11 is working can be inferred via the universal transitivity rule. For all x_11, x_11 will work or x_11 will play a game can be inferred via the universal resolution rule. For all x_11, x_11 will work if and only if x_11 will make tea can be inferred via the universal biconditional introduction rule. For all x_11, x_11 will make tea if and only if x_11 will work can be inferred via the universal biconditional introduction rule.