Binary (81,5)-code with minimal distance 40 

[101010101010101010101010101010101010101010101010101010101010101010101010101010100]
[010101010101010101010101010101010101010101010101010101010101010101010101010101010]
[000000000011111111110000000000111111111100000000001111111111000000000011111111110]
[000000000000000000001111111111111111111100000000000000000000111111111111111111110]
[000000000000000000000000000000000000000011111111111111111111111111111111111111110]