There should be a law against the use of the robots tag except in very special cases.
In no case should you ever use the index,follow variation as that just instructs the bot to do what he would do if there was no tag there in the first place so its just code bloat.
The noindex parameter will cause your page not to be indexed so only use it if you don't want your page in the search engines at all. The nofollow parameter seems useless to me but then I guess there may be some occassions where you don't want the bots to follow the links you inserted?
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