Sentence:  In addition , the right to vote the General Motors stock held by du Pont was to be vested in du Pont 's stockholders , other than Christiana and Delaware and the stockholders of Delaware ; du Pont , Christiana , and Delaware were to be enjoined from acquiring stock in or exercising control over General Motors ; du Pont , Christiana , and Delaware were to be prohibited to have any director or officer in common with General Motors , and vice versa ; and General Motors and du Pont were to be ordered to terminate any agreement that provided for the purchase by General Motors of any specified percentage of its requirements of any du Pont manufactured product , or for the grant of exclusive patent rights , or for a grant by General Motors to du Pont of a <WSD>preferential</WSD> right to make or sell any chemical discovery of General Motors , or for the maintenance of any joint commercial enterprise by the two companies . 
Meaning of the word marked with <WSD> tags:  manifesting partiality