What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Linda is making tea or it is not snowing. Linda is making tea if and only if Barbara is an astronaut. It is snowing or Barbara is an astronaut.
If it snows, then Linda is making tea. If Linda makes tea, then Barbara is an astronaut. If Barbara were an astronaut, then Linda is making tea.