perfecta
noun [ C ] uk/pəˈfek.tə/ us/pɝːˈfek.tə/
（赛马等中的）正序连赢（指博彩人必须把第一、第二名的马的确切顺序排好的一种下注方法）
a bet (= an amount of money that you risk on the result of something, such as a horse race) in which the horses, etc. that come first and second must be picked in the right order
Synonym: exacta
Compare: trifecta