... x2) In the second clause we not know that the man is standing on the ladder he could be on the r o o f - and we not know what "the top" is the top of These facts fall out of recognizing the parallelism ... terms of a co-recursion in which the similarity of properties is defined in terms of the similarity of arguments, and the similarity of arguments is defined in terms of the similarity of properties ... Jerry R and Andrew Kehler Forthcoming A general theory of parallelism and the special case of VP ellipsis Technical report, SRI International Hobbs, Jerry R., Mark E Stickel, Douglas E Appelt, and...