We cannot absolutely know that all these exact adaptations are the result of preconcert. but when we see a lot of framed timbers, different portions of which we know have been gotten out at different times and places and by different workmen-stephen, franklin, roger, and james, for instance-and when we see these timbers joined together, and see they exactly make the frame of a house or a mill, all the tenons and mortices exactly fitting, and all the lengths and proportions of the different pieces exactly adapted to their respective places, and not a piece too many or too few-not omitting even scaffolding-or, if a single piece be lacking, we can see the place in the frame exactly fitted and prepared to yet bring such piece in -- in such a case, we find it impossible not to believe that stephen and franklin and roger and james all understood one another from the beginning, and all worked upon a common plan or draft drawn up before the first lick was struck.

this excerpt from lincoln's speech gives the speech's most radical example of a(n)

allusion
analogy
inference
seminal text