Common vocabulary between pages

[Koen G]

But VM, Timm and Dante all show the pink squares bottom right. Wouldn't this imply that any grid you see is due to text length per page? Would it be clearer if you somehow normalize for this? 

One way to do this would be to limit the number of words to x per page and omit those pages that don't have enough words, but that may be a lot of work.