No that is not my point.
The point is a discussion about gap vs book (meaning entry).
If I have 3 entries (index):
Book a (1)
Book b (3)
Book c (6)
I'm missing 3 books (2, 4, 5)
But I have 2 gaps {2}. {4,5}
Code:
Entries 3
Missing 3
Gaps 2
1-.-3-.-.-6
.-X-.-X-X-.
.-X-.-XxX-.