Binary (42,6)-code with minimal distance 20 

[100000001111001111111111111110000000000000]
[010000011000101010011001010100101111101011]
[001000111111001001111100100101100110011111]
[000100110100011111101001101000101010101100]
[000010001001101111001111000001111000011110]
[000001000010010000111111111000000111111110]