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All patent practitioners recognize that a single prior art reference can be used to reject claims in an obviousness rejection. However, the issue is whether the Patent Office must provide additional evidence, above and beyond the sole prior art reference, when using common sense to conclude the invention is obvious. Recently, the Federal Circuit held that the Board misapplied the law on the permissible use of common sense in an obviousness analysis. Arendi S.A.R.L. v. Apple Inc., No. 2015-2073, 2016BL258032, 5 (Fed. Cir. Aug. 10, 2016).