contains three consecutive zero bits. Removing the all-ones pattern (11111) from the remainder leaves 16 suitable code words.

The GCR RLL code:

11 of the nibbles (other than xx00 and 0001) have their code formed by prepending the complement of the most significant bit; i.e. abcd is encoded as abcd. The other five values are assigned codes beginning with 11. Nibbles of the form ab00 have codes 11ba, i.e. the bit reverse of the code for ab11. The code

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