Binary (20,19)-code with minimal distance 2 

[10000000000000000001]
[01000000000000000001]
[00100000000000000001]
[00010000000000000001]
[00001000000000000001]
[00000100000000000001]
[00000010000000000001]
[00000001000000000001]
[00000000100000000001]
[00000000010000000001]
[00000000001000000001]
[00000000000100000001]
[00000000000010000001]
[00000000000001000001]
[00000000000000100001]
[00000000000000010001]
[00000000000000001001]
[00000000000000000101]
[00000000000000000011]