Because we permit paths that traverse both forwards and backwards along the same dependency-for example, in the co-occurrence white/JJ, AMOD •AMOD, dry/JJit is logical to consider white/JJ, AMOD • DOBJ •DOBJ•AMOD, dry/JJ a valid co-occurrence.
in line with our decision to include white/JJ, , white/JJ rather than white/JJ, AMOD •AMOD, white/JJ , all co-occurrence types are canonicalized through a dependency cancellation process in which adjacent, complementary dependencies are cancelled out.