sentence: word-medial separator in finnish and swedish , the colon can appear inside words in a manner similar to the apostrophe in the english possessive case , connecting a grammatical suffix to an abbreviation or initialism , a special symbol , or a digit ( e.g. , finnish usa : n and swedish usa : s for the genitive case of '' usa '' , finnish % : ssa for the inessive case of '' % '' , or finnish 20 : een for the illative case of '' 20 '' ) .