What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Patricia is making tea or it is windy. If Patricia makes tea, then Charles is writing a letter. Charles is writing a letter if and only if it is windy. If Jessica were an astronaut, then Charles is not writing a letter.
If Charles writes a letter, then it is windy. If it is windy, then Charles is writing a letter.