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The Wu Family received the medicine and saw it was exactly one bowl's worth, giving each other headaches with a look.
This Yan Family's daughter really calculated it down to a perfect flat bowl of medicine!
Moreover, since neither the father and son had a good understanding of traditional Chinese medicine, even if they tasted it themselves, they wouldn't be able to discern the ingredients!
The Wu Family indeed invited two old Chinese medicine practitioners in advance, but when these practitioners saw the small amount of the medicine decoction, and that the bowl did not contain even a bit of residue or powder, they could at most identify the common ingredients. As for any powder or granules in the medicine, they truly had no way of identifying them.