of its sense of fun or energy 
(ROOT (PP (IN of) (NP (NP (PRP$ its) (NN sense)) (PP (IN of) (NP (NN fun) (CC or) (NN energy))))))
(ROOT (PP (IN ) (NP (NP (PRP$ ) (NN )) (PP (IN ) (NP (NN ) (CC ) (NN ))))))