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 is not an electrician. For all x_7, x_7 is sad if and only if x_7 is a carpenter. For all x_7, x_7 is a carpenter if and only if x_7 is a soldier. For all x_7, x_7 is an electrician if and only if x_7 is sad.
For all x_7, if x_7 were sad, then x_7 is a carpenter. For all x_7, if x_7 were a carpenter, then x_7 is a soldier. For all x_7, if x_7 were an electrician, then x_7 is sad. For all x_7, if x_7 were a carpenter, then x_7 is sad. For all x_7, if x_7 were a soldier, then x_7 is a carpenter. For all x_7, if x_7 were sad, then x_7 is an electrician. For all x_7, x_7 is not sad.