The answer is t16. Here is why:
=(t8)2
=(t8)*(t8)
=(t*t*t*t*t*t*t*t)*(t*t*t*t*t*t*t*t)
=t*t*t*t*t*t*t*t*t*t*t*t*t*t*t*t
=t16
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