[计] document document similarity matrix
wén xiàn wén xiàn xiāng sì xìng jǔ zhèn ㄨㄣˊ ㄒㄧㄢˋ ㄨㄣˊ ㄒㄧㄢˋ ㄒㄧㄤ ㄙˋ ㄒㄧㄥˋ ㄐㄩˇ ㄓㄣˋ