For each of the following languages, give a recursive description of the language. Your basis step must explicitly enumerate a finite number of initial elements. Try to use the shortest description possible (in terms of the number of recursive rules and the number of basis rules). Briefly (1-2 sentences) justify that your description defines the same language but do not give us a full proof; (a) Binary strings that start with 0 and have odd length (i. e. an odd number of characters)
(b) Binary strings r such that len(x) = 1 (mod 3) where len() is the number of characters in r.
(c) Binary strings with an odd number of Os.

i would first let him be aware that a cover letter is official and confidential and it requires a proper formatting so that the employer doesn't have hard time when going through it. he should write it in paragraphs of about two to four sentences and use proper grammar a , spelling and proper punctuation. i will also advice him not to be emotional and not also to use images.then base his attention to the details of the job described and not other things. that is he be specific to the responsibilities and to the employers requirements. on this he should make sure that the letter reflects how good he is for the requirements detailed by the employer

the letter should not be too long nor too short.