Mark sentences as "not directly linked".
Reason / Why does it help?
Short: Working together on finding directly linkable sentences gets enabled.
If someone tries to find indirectly linked sentences, that could be directly linked, he/she can use this search:
He/She reads through all 65 pages of sentences and figured, all indirectly linked sentences are not directly linkable.
Now a second user wants to do the same: Trying to directly link indirectly linked sentences. This second user will also have to read through all 65 pages of sentences to figure, there is nothing to do.