Binary (21,11)-code with minimal distance 6 

[100000000001111000111]
[010000000001110100100]
[001000000001101010010]
[000100000001100101011]
[000010000001100011101]
[000001000001011001001]
[000000100001010110011]
[000000010001010011110]
[000000001001001110101]
[000000000101001101110]
[000000000010111111111]