[一拍即合, yī pāi jí héㄧ ㄆㄞ ㄐㄧˊ ㄏㄜˊ] lit. on the beat, together now (成语 saw); Start dancing!; fig. things fit together at one go; to click together; to chime in easily#34232
[物以类聚,人以群分 / 物以類聚,人以群分, wù yǐ lèi jù, rén yǐ qún fēnㄨˋ ㄧˇ ㄌㄟˋ ㄐㄩˋ, ㄖㄣˊ ㄧˇ ㄑㄩㄣˊ ㄈㄣ] Similar things group together, similar people fit together (成语 saw); Birds of a feather flock together.