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A special case of constant weight codes are the one-of-N codes, that encode <math>\log_2 N</math> bits in a code-word of <math>N</math> bits. The one-of-two code uses the code words 01 and 10 to encode the bits '0' and '1'. A one-of-four code can use the words 0001, 0010, 0100, 1000 in order to encode two bits 00, 01, 10, and 11. An example is [[dual rail encoding]], and chain link <ref>{{cite news
| title=System-on-Chip Design using Self-timed Networks-on-Chip
| url=http://www.design-reuse.com/articles/14561/system-on-chip-design-using-self-timed-networks-on-chip.html
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