Sentence:  For every single trace there is a <WSD>downtrace</WSD> with each individual degree being between 2 < &#124;fif&#124; < &#124;v&#124;, such that all possible combinations beneath the previously entailed degrees are generated by the function Ξ. 
Meaning of the word marked with <WSD> tags:  The subtree of a tree structure that is determined by an attribute of a parent node.