So I guess everyone learned the answer to the question I wrote before,
How many 1BY8GQbnueY starts are there in our 67 bit range? The correct answer is 4.

I disagree with you. Firstly, puzzle #67 has a range width of 66 bits.
The second is that 1BY8GQbnueY has a length of 56 bits and accordingly in the entire range of 66 bits there are approximately 1024 such combinations.