support more than 2 argument-comparators
support more than 2 argument-comparators

ktakashi/picrin,leavesbnw/picrin,omasanori/picrin,dcurrie/picrin,leavesbnw/picrin,dcurrie/picrin,koba-e964/picrin,koba-e964/picrin,koba-e964/picrin,picrin-scheme/picrin,omasanori/picrin,ktakashi/picrin,picrin-scheme/picrin,leavesbnw/picrin,ktakashi/picrin