Sentence:  In any metrical tree or constituent, the HTE of the subconstituent dominated by "l" is: a. One register step lower than the HTE of the <WSD>subconstituent</WSD> dominated by "h" when the "l" <WSD>subconstituent</WSD> is on the "right"; b. at the same register as the HTE of the <WSD>subconstituent</WSD> dominated by "h" when the "l" <WSD>subconstituent</WSD> is on the "left". 
Meaning of the word marked with <WSD> tags:  A part or component of a syntactic, morphological, or phonetic constituent.