Linkers

By definition, a linker connects two elements, and appears between them. The contexts used to find linkers are:

[ NU _ NU ]	linker of nuclei
[ A _ A NU ]	linker of left adjuncts
[ NU A _ A ]	linker of right adjuncts

Elements which occur in these contexts but which have already been categorized as nucleus or adjuncts are deleted from the list. Linkers found in the training data are the tags CC, TO, and , (comma).