The modern Japanese writing system uses a combination of logographic kanji, which are adopted Chinese characters; and phonographic kana, which evolved from cursives/components of Chinese characters. Modern kana consists of two sets of syllabaries: hiragana, used primarily for native or naturalized Japanese words and grammatical elements; and katakana, used primarily for foreign names, loanwords (gairaigo), onomatopoeia, scientific terminology and sometimes for emphasis. Almost all written Japanese sentences contain a mixture of kanji and kana. Because of this mixture of scripts, in addition to a large inventory of usable kanji characters, the Japanese writing system is considered to be one of the most complicated currently in use.