What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one x_18 for which x_18 will go running. For all x_18, if x_18 goes running, then x_18 is writing a letter. For all x_18, x_18 will write a letter if and only if x_18 will play a game. For all x_18, x_18 will make tea.
There is at least one x_18 for which x_18 will write a letter. There is at least one x_18 for which x_18 will go running and x_18 will make tea. There is at least one x_18 for which x_18 will make tea and x_18 will go running. For all x_18, if x_18 writes a letter, then x_18 is playing a game. For all x_18, if x_18 plays a game, then x_18 is writing a letter.