( ( ( the octahedron ) ( , ( of ( ( eight ( equilateral triangles ) ) ( -LRB- ( ( XIII .14 ) -RRB- ) ) ) ) ) ) ; )
(ROOT (NP (NP (DT the) (NN octahedron)) (PRN (, ,) (PP (IN of) (NP (NP (CD eight) (JJ equilateral) (NNS triangles)) (PRN (-LRB- -LRB-) (NP (NNP XIII) (CD .14)) (-RRB- -RRB-))))) (: ;)))
the octahedron , of eight equilateral triangles (XIII.14);
(ROOT (S (NP (NP (DT The) (CD eight) (NNS sides)) (PP (IN of) (NP (DT an) (NN octahedra)))) (VP (VBP are) (PP (IN in) (NP (NP (DT the) (NN shape)) (PP (IN of) (NP (DT a) (NNS triangles)))))) (. .)))