Hello. I happen to read a sentence which goes like this:For this purpose, we must avail ourselves of such principles as add something to the original conception--something not identical with, nor contained in it...There's one thing in this sentence I don't quite understand: Why is "as" followed by a bare infinitive as I'm not a native speaker and have never seen "as" used this way? In my personal opinion, "as" in this sentence can be interpreted in two ways: "so as to", or linked to "such" therefore the start of an illustration.Which one is right, or are both of my interpretations wrong? Could somebody help analyze this sentence? Thanks a million.