questions about SIMPLE algorithm (by Patankar)

Nutty

Help me please....

I try to do some computer codes for SIMPLE algorithm by using equations in "Numerical Heat Transfer and Fluid Flow" by Suhas V. Patankar. But I'm confused with terms in this book. My questions are as following

1. From page 122, I need to solve eqs.(6.8) to (6.10). But I don't understand term "nb". Did they mean neighbors on nodes or CV faces? For an example, in equation (6.8), I have to submit u*nb to obtain u*e, did u*nb mean "uP and uE" or "up and ue" or "uP, uE, and ..."?

2. From page 101, I need to find coefficients in equation (5.62), do I have to use all parameter on the nodes or CV faces? For an example, to calculate aE, I have to use all parameter on "E"(node) or "e"(east CV face)?

I hope there are some kind people feel free to help one stupid student. Thank you