use k format specifier in pair.c
use k format specifier in pair.c

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