It's DOWNRIGHT SPOOKY (until you realize EXACTLY how it is done.)
Try it!
Give it to your students and collegues to see how quickly THEY figure it out.
If YOU have trouble with the explanation, I suggest using a pencil and
paper to aid your observations.
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Chuck Britton Education is what is left when
britton@odie.ncssm.edu you have forgotten everything
North Carolina School of Science & Math you learned in school.
(919) 286-3366 x224 Albert Einstein, 1936