Ok, this is where I sometimes get myself into trouble (and thanks for a great example - no offense intended). I tend to take people at face value unless something jumps out at me, so when I see absolutes like "exhaust all possibilities" and "every possible cause" it's difficult for me to interpret how literally that should be taken. I can't tell if the writer is implying some reasonability (has some number in mind), or if they really expect/want to keep going until - literally - they've exhausted every and all possibilities, so I make some comment or observation (like my first post in this thread). My intent was just to interject some balance - food for thought, and no more.

Doc