[blml] natural bids and conventional bids

[Ed Reppert]

"Natural and Conventional are mutually exclusive." So said a poster  
on bridge base online.

It seems to me we resolved this in the recent thread "conventional" -  
and did so in such a way as to make the quoted assertion false. But I  
can't now find it. *Did* we resolve it in that way?

I think:

Some bids are natural.
Some bids are conventional.
Some bids are artificial.
Some conventional bids are also natural.
All artificial bids are conventional.

One could argue that all bids are conventional (that is, they are a  
matter of agreement between partners) but I don't think the laws mean  
to go there.