The recipe uses a large amount of pepper, and not just any pepper, but a special blend imported from India. (Merriam-Webster’s)
You have to be a member to go there. They won't let just any person in. (Merriam-Webster’s)
We don’t publish just any letters: we reject more than half of those submitted. (CGEL,p.383)
When we use free choice any in negative contexts, do we have to add an intensifier, just? From my mother tongue’s aspect, logically, it seems to be added to the free choice any. But the grammar book doesn’t say about that. Whereas the dictionary’s both online and its Learner’s paper book has bold characters for these two words - just any’s, seemingly saying they are a mate. Without any, don’t we use the expression, or does the word, just, only clarify the speaker’s intention of negating the free choice?