 then that's sufficient. So a drop of water would be, I think, doubtfully valid. If you can't pour it, in other words, it has to flow over the head of the person. It also has to touch the skin too, as opposed to just touching the hair. So that's the rule of thumb. As long as there's enough water there that it can flow, even if it's just a small amount and it's for a short time, that's what's considered sufficient. Now, obviously, the ideal would be to have more than that.