The problem is that commonly used software for inputting Chinese characters, including that used by police departments responsible for

②

identity cards (which every Chinese must carry), cannot

③

very rare characters. In China, the usual way of writing a character on a computer is to

④

its pronunciation using Roman letters, then choose from a list of possible options (most characters have many ★homonyms[3]). A rare character might not

⑤

up on the list.