It is therefore very important to find such codes which are as efficient as possible, that is, for a fixed code length, find a code composed of as many words as possible, while respecting the minimum distance among the words.

With **Hamming complement**, you can have a training on this question. The
server will give you a `partial' code with several words, and it is up to
you to add other words to the code, as many as possible, while respecting
the minimum distance 3. And we assure you that each exercise proposed has at
least one solution which is linear or affine (but you are free to find other
solutions).