Additional Problem 3-15 Find a regular expression to describe the following language: {A, a, aa, aaa, aada, aaaaa HA, b, bb, bbb, bbbb} Then, explain why your regular expression also represents the following languages . {al"(A, b, bb, bbb bbbb) Additional Problem 3-16 Find a regular expression to describe the following language labral n Natural Numbers) Additional Problem 3-17 Let L&M be languages where L= { a, b, bb) and LM La, b, ab, bb, abb, bbb, bbbb What is M? Additional Problem 3-18 Let L be the language (a, b). What is L