However, not every "ss" can be written as "ß". German often puts two or more words together to make a longer word. If the new word has "ss", it cannot be written as "ß". For example, "Voßstraße" is two words joined together ("Voß" and "straße"). It can also be written as Vossstraße but not as "Vosßtraße" because "sstraße" (or "ßtraße") is not a word, and the "ß" is in the word "Voss" ("Voß").