A dissolution test is crucial in assessing that the release of a drug is as close to $100\%$ as possible.

$($i$)$ Explain the terms f$1$ and f$2$ in relation to dissolution testing and give an example of where these evaluations are useful.

$($ii$)$ If a value of $72$ was obtained for an f$2$ evaluation, would the test and reference products be considered bioequivalent? Briefly explain your reasoning.