So click a few times. Clearly most of the resulting codes consist mostly of 0's. If you send a binary message, and on its way to the recipient most of the 1's get changed to 0's, then your message will not be reliable. INFORMATION IS LOST. Let's suppose ALL the 1's got changed to 0's. Then your message would contain NO INFORMATION. That's because you're really left with a ONE SYMBOL alphabet. You need at least two to convey information. If only a portion of the 1's get changed to 0's then you still have some information left. How much?