Because of the divergence of variants, some exceptional morphemes aren't located in Standard Chinese. Characters almost never used in Standard Chinese have also been developed or inherited from archaic literary expectations to signify these exceptional morphemes. For example, characters like 冇 and 係 are actively used in Cantonese and Hakka, https://medium.com/@AsianSupermarketAdelaide/tradition-meets-taste-at-the-heart-of-asian-groceries-adelaide-fe22b8445b42