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i do not understand how this category of dwellings can be defined for one piece of legislation but is apparently undefinable for the purpose of controlling the numbers
nid wyf yn deall sut y gellir diffinio'r categori anheddau hwn ar gyfer un eitem ddeddfwriaeth tra ymddengys nad oes modd ei ddiffinio i'r diben o reoli'r niferoedd ohonynt