( ( ( ( ( The second ) ( solid ( is ( composed ( of ( ( ( the ( same triangles ) ) , ) ( which ( ( ( ( unite ( as ( eight ( equilateral triangles ) ) ) ) , ) and ) ( ( ( make ( one ( solid angle ) ) ) out ) ( of ( four ( plane angles ) ) ) ) ) ) ) ) ) ) ) ) -- ) ( ( six ( of ( these angles ) ) ) ( form ( a ( regular octahedron ) ) ) ) ) . )
(ROOT (S (S (NP (DT The) (NN second)) (ADVP (RB solid)) (VP (VBZ is) (VP (VBN composed) (PP (IN of) (NP (NP (DT the) (JJ same) (NNS triangles)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VP (VB unite) (PP (IN as) (NP (CD eight) (JJ equilateral) (NNS triangles)))) (, ,) (CC and) (VP (VB make) (NP (CD one) (JJ solid) (NN angle)) (PRT (RP out)) (PP (IN of) (NP (CD four) (NN plane) (NNS angles)))))))))))) (: --) (S (NP (NP (CD six)) (PP (IN of) (NP (DT these) (NNS angles)))) (VP (VBP form) (NP (DT a) (JJ regular) (NN octahedron)))) (. .)))
The second solid is composed of the same triangles, which unite as eight equilateral triangles, and make one solid angle out of four plane angles--six of these angles form a regular octahedron.
(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)))))) (. .)))