This is part of archived UD v1 documentation. See http://universaldependencies.org/ for the current version.
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dep: unspecified dependency

A dependency is labeled as dep when a system is unable to determine a more precise dependency relation between two words. This may be because of a weird grammatical construction, a limitation in software (e.g. the Stanford Dependency conversion), a parser error, or because of an unresolved long distance dependency.

Then , as if to show that he could , ...
dep(show, if)

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