Analogously, pronoun j3 also co-refers with i1 1 , and pronouns j2 and j4 both co-refer with i2: Scientists i1 know that the phenomenon i2 occurs once every three to seven years i3 : they j1 can detect when it j2 is coming, they j3 perceive when it j4 is going away.
in order to select the most useful features for solving the problem at hand we started by taking the entire set of 20 learning features into account.