What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_5, x_5 will make tea or x_5 will write a letter. For all x_5, if x_5 writes a letter, then x_5 is climbing a mountain. For all x_5, if x_5 makes tea, then x_5 is drinking water. For all x_5, if x_5 drinks water, then x_5 is climbing a mountain.
For all x_5, if x_5 makes tea, then x_5 is climbing a mountain.