The check matrix of a [12,7,5]₅. For more information see Inverting construction Y₁.

100023014301
010013013144
001012012020
000111000113
000000111111

The weight distribution:

A'₀= 1, A'₆= 20, A'₇= 244, A'₈= 460, A'₉= 600, A'₁₀= 884, A'₁₁= 740, A'₁₂= 176.

A₀= 1, A₅= 364, A₆= 1248, A₇= 3876, A₈= 10540, A₉= 18660, A₁₀= 21840, A₁₁= 16252, A₁₂= 5344.

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