Binary (21,9)-code with minimal distance 8 

[100000000110101001011]
[010000000110010101110]
[001000000110001110101]
[000100000101100100111]
[000010000101011001101]
[000001000101001111010]
[000000100100111010110]
[000000010100110111001]
[000000001011111111111]