You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: yaku_yakuman.go
    path of file: ./repos/mahjong-helper/util
    
    the code of the file until where you have to start completion: package util

// 门清限定
func (hi *_handInfo) suuAnkou() bool {
	if hi.WinTile == hi.divid
    
func (hi *_handInfo) ryuuiisou() bool {
	if hi.divideResult.IsChiitoi {
		return false
	}

	for _, tile := range hi.allShuntsuFirstTiles {
		if tile != 19 { // 只能是 234s
			return false
		}
	}
	if !InInts(hi.divideResult.PairTile, _ryuuTiles) {
		return false
	}
	for _, tile := range hi.allKotsuTiles {
		if !InInts(tile, _ryuuTiles) {
			return false
		}
	}
	return true
}