Binary (30,21)-code with minimal distance 4

[100000000000011000000000000100]
[010000000000010100000000000100]
[001000000000010010000000000100]
[000100000000010001000000000100]
[000010000000010000100000000100]
[000001000000010000010000000100]
[000000100000010000001000000100]
[000000010000010000000100000100]
[000000001000010000000010000100]
[000000000100010000000001000100]
[000000000010010000000000100100]
[000000000001010000000000010100]
[000000000000110000000000001100]
[000000000000001000001100000100]
[000000000000000100001010000100]
[000000000000000010001001000100]
[000000000000000001001000100100]
[000000000000000000101000010100]
[000000000000000000011000001100]
[000000000000000000000101010100]
[000000000000000000000010101100]