Also, I would query whether 7 is strictly a tool.Wouldnt you say that in normal usage a toolis something you perform an operation with, ie something that is moved by the operator? And the very essence of a 7 is that it is static. And wouldnt 6 be something you make tools out of, rather than a tool itself? I am probably being excessively picky on the last one, you might say,I suppose"He was scraping the mammoth skin with a 6", so maybe I'll withdraw that objection.