Depending on the state language proficiency level according to the statements of workers the certain groups are formed. Give the titles to definitions:
1. workers who do not know the state language at all;
2. workers who do not know the state language at all but for whom Kazakh is the mother tongue;
3. workers with low level of the state language proficiency, who can not both read and write in the state language;
4. workers with average state language proficiency who can read and prepare a limited kind of documents;
5. workers with excellent ability to read and write in Kazakh, but find difficult to prepare the documents of high quality in the state language.