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interface PriceCells { bool isCellLimit(double price); // next-higher cell limit or NaN if no more cells double nextCellLimit(double price); // next-lower cell limit or NaN if no more cells double previousCellLimit(double price); // go n steps down double nCellLimitsDown(double price, int n); // go n steps up double nCellLimitsUp(double price, int n); }