So, what's the idea? If I know what my hash function does, it maps, in this case characters into a range zero to 256, which is zero to 255, I create a list that long, and I simply mark things.
These remarkable fellows persuaded otherwise sensible citizens to suspend disbelief long enough to sell a product of zero value that claimed an exhausting list of miraculous cures and benefits without any evidence whatsoever that the product was either safe or effective.