Re: "You cannot buy all what you like!"
You cannot buy all what you like. X
In that sentence, 'all' functions as a pronoun conveying the idea of 'all the things/material'. 'What also functions as a pronoun, conveying the idea 'the thing(s) that'. SO:
You cannot buy all (= all the things) that you like.
You cannot buy all (=all the things) what (=the things that) you like. X
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