Assuming that "66.228" is a section from a specific code and "5r 109" is another section from another code, perhaps related to federal regulations or contracts. Alternatively, maybe there's a misformatting where the user intended to cite 66 CFR 228.5r.109? Or perhaps 66 CFR is Title 66 (which isn't a CFR title, the titles go up to 75), so that's not it.
