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R. Kook on When an Obligation Doesn't Nullify a Prohibition (26 Tishrei)
שו"ת משפט כהן קי"ט 26 Tishrei 5677 (1916)
R. Kook deals with a conceptual issue that affects many halachic questions, how an aseh, an obligation, does or doesn't affect a lo ta'asei, a prohibition.