Question: Please find: a. a language L over {a,b}* that is neither {} nor {a,b}* and which satisfies L = L*. b. an infinite language L

Please find:

a. a language L over {a,b}* that is neither {} nor {a,b}* and which satisfies L = L*.

b. an infinite language L over {a,b}* for which L L*

Explain in great detail so I can understand. Like what does it mean by the * symbol

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