In general, the lexical head of a derived category is determined by the (primary) functor, so that the lexical head of a category X or X|Z 1 |...|Z n that resulted from combining X|Y and Y or Y|Z 1 |...|Z n is identical to the lexical head of X.
we will focus on the English CCGbank but these details apply with only minor changes to German and Chinese as well.