Binary (31,23)-code with minimal distance 4

[1000000000000000000000000111000]
[0100000000000000000000000111110]
[0010000000000000000000000111101]
[0001000000000000000000000101010]
[0000100000000000000000000101001]
[0000010000000000000000000101111]
[0000001000000000000000000101100]
[0000000100000000000000000110010]
[0000000010000000000000000110001]
[0000000001000000000000000110111]
[0000000000100000000000000110100]
[0000000000010000000000000100011]
[0000000000001000000000000011111]
[0000000000000100000000000011100]
[0000000000000010000000000011010]
[0000000000000001000000000011001]
[0000000000000000100000000001110]
[0000000000000000010000000001101]
[0000000000000000001000000001011]
[0000000000000000000100000010110]
[0000000000000000000010000010101]
[0000000000000000000001000010011]
[0000000000000000000000100000111]