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A quick web search indicates that in English, boats are commonly characterized by their number of "lower berths" WHETHER OR NOT there is an "upper berth" : "All cabins have private facilities and either two lower berths or a lower and an upper berth."
Explanation: Not totally satisfying, but since there may be several beds per cabin, you're not counting cabins here. I'm regarding the potential existence of "upper berths" in some cabins as being of secondary importance, and not worth counting (see all my above remarks).
siragui Local time: 13:30 Native speaker of: English