Sentence:  A randomization of `` ups '' and `` downs '' is more likely than ordered `` ups '' and `` downs '' in position ( 3 ) since the hydrogen atoms are well separated and so the position of one could hardly affect the position of another , and also since <WSD>ordered</WSD> `` up '' and `` down '' implies a larger unit cell , for which no evidence exists . 
Meaning of the word marked with <WSD> tags:  having a systematic arrangement; especially having elements succeeding in order according to rule