TwT: Intra collection duplicates are a recurring issue eg in Cho Chikuns. I would prefer (a) FAQ with known duplicates and the offer "create a tsumego fitting the collection to replace the duplicate" (b) (was it Farkas?) answering: "Ask Cho Chikun.) Means blame it on who done it not us. (c) I dislike to have no "policy" dealing with that issue.
caranthir: To me, Cho Chikuns are not really a problem. I don't remember that many exact recurring positions, just many similar (exact same tesuji with some irrelevant stones in other places), or positions that have been played out more, so that the killing or living or stuff is easier to see. Even if there are exact recurring positions (and I don't remember seeing many), we can handle that by just having this resistance in one and that in the next.
To me, Cho Chikuns are not really a problem. I don't remember that many exact recurring positions, just many similar (exact same tesuji with some irrelevant stones in other places), or positions that have been played out more, so that the killing or living or stuff is easier to see. Even if there are exact recurring positions (and I don't remember seeing many), we can handle that by just having this resistance in one and that in the next.