Binary (20,12)-code with minimal distance 4 

[10000000000001101010]
[01000000000001101101]
[00100000000001100001]
[00010000000001100111]
[00001000000001100100]
[00000100000001001011]
[00000010000001001100]
[00000001000000101110]
[00000000100000101001]
[00000000010000100101]
[00000000001000100011]
[00000000000100001111]