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There is no solution for that constellation.

Consider the point labeled 000, it has four (perhaps five) neighbours, for a three bit code they can't all differ from 000 by a single bit.

There is no solution for that constellation.

Consider the point labeled 000, it has four neighbours, for a three bit code they can't all differ from 000 by a single bit.

There is no solution for that constellation.

Consider the point labeled 000, it has four (perhaps five) neighbours, for a three bit code they can't all differ from 000 by a single bit.

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There is no solution for that constellation.

Consider the point labeled 000, it has four neighbours, for a three bit code they can't all differ from 000 by a single bit.