Binary (31,8)-code with minimal distance 12 

[1000000011111111111100000000000]
[0100000011111100000011111100000]
[0010000011111010000010000011111]
[0001000011100101100001100011100]
[0000100011010010011001011010010]
[0000010010110001010110010101001]
[0000001000001111111001001110101]
[0000000110001101001111110101110]