1. What does this string become after bit stuffing? 
2. At the receiver, what must be the rule for de-stuffing? 
3. Take the answer to part
4. (a) and de-stuff it with the answer to part 
5. (b), and show that the original string is again obtained. 
6. Suppose the stuffing rule was "stuff a '0' after any occurrence of '01⁵' in the original SDU".  Comment on the correctness and efficacy of this rule.  If possible, answer parts (a), (b) and (c) again on the basis of this rule. 
7.