What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_7, x_7 will write a letter if and only if x_7 is excited. For all x_7, x_7 will not drink water. For all x_7, x_7 will drink water if and only if x_7 is excited. For all x_7, x_7 will write a letter or x_7 is a musician.
For all x_7, if x_7 writes a letter, then x_7 is excited. For all x_7, if x_7 drinks water, then x_7 is excited. For all x_7, if x_7 were excited, then x_7 is writing a letter. For all x_7, if x_7 were excited, then x_7 is drinking water. For all x_7, x_7 is not excited.