To simplify $y^{-3 / 2} y^{5 / 3}$, we can use the rule that $a^m \cdot a^n = a^{m+n}$ for any real numbers $m$ and $n$. So, we have:
$y^{-3 / 2} y^{5 / 3} = y^{(-3 / 2) + (5 / 3)}$
Now, we need to find a common denominator for the fractions $-3/2$ and $5/3$.
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