( ( Our bond ) ( ( is ( one ( of ( a kind ) ) ) ) . ) )
(ROOT (S (NP (PRP$ Our) (NN bond)) (VP (VBZ is) (NP (NP (CD one)) (PP (IN of) (NP (DT a) (NN kind))))) (. .)))
Our bond is one of a kind.
(ROOT (S (NP (DT A) (JJ double) (NN bond)) (VP (VBZ consists) (PP (IN of) (NP (NP (CD one) (NN sigma) (NN bond)) (CC and) (NP (CD one) (NN pi) (NN bond))))) (. .)))