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Identify the correct steps involved in the algorithm that finds $a^{2^n}$ for a real number a and a positive integer $n.($Check all that apply.$)$

Check All That Apply

procedure twopower$($n$.$ positive integer, a$.$ real number$)$

if $n=1$ then return $a^2$

if $n=1$ then return a

else return twopower$($n$-1,$ a