| 1. | There are 61 versions of square IQR codes, and 15 versions of rectangular codes.
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| 2. | The " Optimal Rectangular Code " used in group code recording tapes not only detects but also corrects single-bit errors.
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| 3. | On top of the RLL code, an error-correcting code called the Optimal Rectangular Code ( ORC ) is applied.
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| 4. | The two-dimensional parity-check code, usually called the optimal rectangular code, is the most popular form of multidimensional parity-check code.
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