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$4\mathrm{.}7\mathrm{.}1($a$)$ What is the clock cycle time if the only types of instruction we need to support are $$ ALU instructions $($ADD$,$ AND, etc.$)?$

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$4\mathrm{.}7\mathrm{.}2($a$)$ What is the clock cycle time if we only have to support LW instructions.