(a + b)(cd)*(a + b) denotes the following set
a. {a(cd)nb|n = 1}
b. {a(cd)na|n = 1} ? {b(cd)nb/n = 1}
c. {a(cd)na|n = 0} ? {a(cd)nb/n = 0} ? {b(cd)na/n = 0} ? {b(cd)nb/n
= 0}
d. {acndnb|n = 1}
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(a + b)(cd)*(a + b) denotes the following set a. {a(cd)nb|n = 1} b. {a(cd)na|n =...
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