That is extremely high, but again: it depends very much of the chosen 'groups' or 'words'. If you use small groups as or and ol, of course there is a 50% or higher overlap.
And on the other hand, it is unclear what you calculate, if you take 98% of all groups, and find them in one page and compare those with the groups in another page,
the difference that you get is simply the difference in counting those groups.
And on the other hand, it is unclear what you calculate, if you take 98% of all groups, and find them in one page and compare those with the groups in another page,
the difference that you get is simply the difference in counting those groups.