You need to think about a few things...
Google will not send "viagra" to 100 pages all on the same C class. So if any of them share keywords then you will need to have different C classes for those only.
If you are not putting them on seperate C's because they all have different targets then you should also not interlink them at all. If you do, you will have google look at them as a link farm.
Even if they are all on seperate class C's they will be a link farm in Google's eyes if you interlinked them all together.
You should do something where you link within niches (if you have seperate C's) and link in a one way fashion. Back and forth links here and there...
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