Prove that a two-input multiplexor is also universal by showing how to build an invertor (not gate), an "and" gate, and an "or" gate using...

Prove that a two-input multiplexor is also universal by showing how to build an invertor (not gate), an "and" gate, and an "or" gate using multiplexor(s). Note that you may need more than one multiplexor for some of the gates.