Power towers and exponents

Algebra Level 1

22=4222=4×42222=4×4×4××4\large \begin{aligned} 2^2 &=& 4 \\ 2^{2^2} &=& 4\times 4 \\ 2^{2^{2^2}} &=& {4\times4\times4\times\cdots\times4} \end{aligned}

How many 4's are there in the last equation?

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