implement some of important list functions listed on srfi-1
implement some of important list functions listed on srfi-1

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