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, if x_7 were sad, then x_7 is curious. For all x_7, if x_7 were curious, then x_7 is writing a letter. There is at least one x_7 for which if x_7 goes running, then x_7 is sad. For all x_7, if x_7 writes a letter, then x_7 is running.
For all x_7, if x_7 were sad, then x_7 is writing a letter. For all x_7, if x_7 were curious, then x_7 is running. There is at least one x_7 for which if x_7 goes running, then x_7 is curious. There is at least one x_7 for which if x_7 writes a letter, then x_7 is sad.