1) (Spts) Write regular expressions for the following: a) I = {a,b} L = { all words with one letter a in them} b) 2 = {a.b} L = { all words that have at least two letter a's or two letter b's in consecutive order C) E = {a,b,c} L = { where every b is immediately followed by a letter c) d) E = {a,bc} L = { all words with at least one substring of abc in them)