This led to some systems using 8 bits (a full byte) instead of 7 bits. The proper name for systems that use 8 bits is called "extended ASCII". Eight bits allows for 256 characters. The first 128 characters must be the same as for ASCII and the rest are usually used for alphabetic letters with accents, for example like É, È, Î and Ü. This solves the problem for languages that are based on the Latin alphabet, although not all extended ASCII systems are the same. Other alphabets, like the Greek alphabet, Cyrillic alphabet need a different set of characters. And some systems like those using Chinese characters still do not work, as they use thousands of characters. So unicode was created to have one common system for all languages.