Write regular expressions for the following languages 1. Language of all words that start with ‘x’ or ‘’y and ends with ‘x’ or ‘z’. 2. Language of all words that do not have ‘x’ or ‘y’ at the third position. 3. Language of all words that starts and ends with a same letters. 4. Language of all words that have ‘z’ at the even (1st, 3rd , 5th, …) positions. 5. Even-even Language