Hi

If the cel is A1, has an "E", or says "End" by the number 
then it is key. Other then A1 and End cels, I have no idea
how you can tell if a cel is key by not seeing the sketch :/

I'd love to know if someone else does. I've just read that
cels at the begining, middle, and end of the sequence are
key.

Reguards
   Jamal