Question: (10 pts) Why are the front end and the back end of a compiler usually implemented as separate passes? 1. 2. (28 pts) For each

(10 pts) Why are the front end and the back end

(10 pts) Why are the front end and the back end of a compiler usually implemented as separate passes? 1. 2. (28 pts) For each of the following languages, write a regular expression that describes the language. (a) (7 pts) The set of strings of length three or more, over alphabet fa, (b) (7 pts) The set of natural numbers divisible by 25. (c) (7 pts) The set of strings that consist of an odd number of a's, over alphabet fa). (d) (7 pts) The set of strings over alphabet (a, b) that begin with at least two a's, and end with at least two b's

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