The following is a grammar for regular expressions over symbols a and b only, using + in place 1 answer below »

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The following is a grammar for regular expressions over symbols a and b only, using + in place of 1 for union, to avoid conflict with the use  of vertical bar as a metasymbol in grammars:

a) Left factor this grammar.

b) Does left factoring make the grammar suitable for top-down parsing?

c) In addition to left factoring, eliminate left recursion from the original

grammar.

d) Is the resulting grammar suitable for top-down parsing?