As per the FAQs for SUPACK please find below justification:
For a quickly dissolving drugs points at 10, 20, 30, and 40 may be more appropriate. Our Clopidogrel is in the same category of quickly dissolving drugs.
These points should be considered as an example. Others points can be used and It is suggested that at least 4 points (other than zero), equally spaced, can be used for comparative dissolution.