S R NAIDOO
Assumptions, sorry.  ... that the figure you give me may be subject to the same kind of variables that we're looking at.  For example, if I say that - we make mistakes as well, now this is non-scientifically speaking, when we look at people standing next to ...(indistinct), I think I'm a little taller than you, I think I'm a little shorter than you, these are variables and it's all - this is observer error and there are many things that come into it.  Allowing for that as well, I think generally speaking you shouldn't be able to rule out.