Binary (21,10)-code with minimal distance 7 

[100000000011101001001]
[010000000011010100101]
[001000000011001010111]
[000100000011000111010]
[000010000010110010011]
[000001000010101100110]
[000000100010100111101]
[000000010010011101011]
[000000001010011011100]
[000000000101111111111]