Yelena Dubok
She competed at the 1998 Winter Olympics and the 2002 Winter Olympics . 
<triplet> 1998 Winter Olympics <subj> 1998 <obj> point in time <subj> 2002 Winter Olympics <obj> followed by <triplet> 2002 Winter Olympics <subj> 1998 Winter Olympics <obj> follows <subj> 2002 <obj> point in time