Consider the following statements. A: Ama is suffering from sore throat B: Ama is in the clinic "If Ama is in the clinic means A=B or A implies B . What does ~B=~A means?

~B=~A means "If Ama is not in the clinic, then she is not suffering from a sore throat." This can also be written as "If Ama is not in the clinic, then she is not suffering from a sore throat" or "Not being in the clinic implies not having a sore throat."