    Sentence’ 1) Based. on” havirig’  atleast one ‘ef the symptoms’,  most Shlers had bee -hung  over’ between: thr@é. and 11    timeés.in the previous year :    Sentencé :2: On. average the  students suffered ‘at least..one  of the 13 symptoms. between  three: and “times in the. last.  year, . °