minusxycondequalminxyyxycondtruexysminusxsymin0v0minu00minsusvsminuvequal00trueequalsx0falseequal0syfalseequalsxsyequalxyminusxyminxyminusxyequalminxyyminusxycondequalminxyyxycondtruexyminusxsyminsusvminuvequalsxsyequalxytruecondtruexyminusxsyminusxycondequalminxyyxytrueminusxyequalminxyyfalseequalsxsyequalxytrueminusxyminxyfalseminsusvminuvtrue