Unlike Drxx, I think the punctuation is very helpful. There are three objects. A colon introduces the list of the three objects, separated by commas and followed by a semicolon, after which we have the definitions.
What fooled me was the use of the symbols n and N, which would normally represent two different numbers. I eventually realised that the capital letter was used at the beginning of a sentence!
Despite this I haven’t completed the endgame. Perhaps it would help, without giving too much away, if someone could tell us whether the third object points upwards or downwards.