Binary (31,7)-code with minimal distance 13 

[1000000111111000000111111000000]
[0100000111110100000100000111110]
[0010000111001011000011000111001]
[0001000110100100110010110100101]
[0000100101100010101100101010011]
[0000010000011111110010011101011]
[0000001100011010011111101011101]