The president meant that Riley needed to walk .
* president ( x _ 1 ) ; mean . agent ( x _ 2 , x _ 1 ) AND mean . ccomp ( x _ 2 , x _ 5 ) AND need . agent ( x _ 5 , Riley ) AND need . xcomp ( x _ 5 , x _ 7 ) AND walk . agent ( x _ 7 , Riley )