The oddities of the bigram "ed"

[ReneZ]

I believe, on all of those charts that are the ed scatter charts that page boundaries are respected. 

OK thanks!
This means that, while 'ed' is essentially absent on about half the pages, these pages are relatively shorter, and if one counts 'normalised pages' by splitting the longer B pages into several parts, 'ed' is essentially absent on much less than half these normalised pages.