What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_10, if x_10 plays squash, then x_10 is curious. For all x_10, if x_10 were a taxi driver, then x_10 is happy. For all x_10, x_10 will write a letter. For all x_10, if x_10 were curious, then x_10 is happy. There is at least one x_10 for which x_10 is a taxi driver or x_10 will play squash.
For all x_10, if x_10 plays squash, then x_10 is happy.