[重点]主攻271649头,主攻271683尾.
1,排除530头,237百,167十,490尾.
2,铁卒:71,76,73,78.
3,三字现:713,718,763,768,714,719,764,976.
4,二定:21XX,26XX,71XX,76XX,4X3X,4X8X,9X3X,9X8X,XX42,XX47.
5,三定:4X33,4X38,4x83,4X88,9X33,9X38,9X83,9X88,7X42,7X47.
6,直码:7142,7147,7192,7197,7642,7647,7692,7697,9133,9138.