english: If 'A + B' means A is the father of B, 'A – B' means A is the brother of B, 'A ÷ B' means A is the
non_english: If 'A + B' stands for 'A is the father of B', 'A – B' stands for 'A is the brother of B', 'A × B' stands for 'A is the wife of B' and 'A