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In page Storey:
"An offset may be used to accommodate unnumbered floors. For example, in a building with floors labelled G, M, 1, 2, ..., 11 and 12, the fourth room in each of those floors could be numbered 104, 114, 124, 134, ..., 224 and 234, respectively—with an offset of 110 in the floor numbers. This trick is sometimes used to make the floor number slightly less obvious, e.g. for security or marketing reasons.
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