at once both refreshingly different and reassuringly familiar 
(ROOT (S (ADVP (IN at) (RB once)) (ADJP (CC both) (RB refreshingly) (JJ different) (CC and) (ADJP (RB reassuringly) (JJ familiar)))))
(ROOT (S (ADVP (IN ) (RB )) (ADJP (CC ) (RB ) (JJ ) (CC ) (ADJP (RB ) (JJ )))))