( ( Just ( as ( ( ( the shape ) ( ( of ( the letter ) ) e ) ) ( above ( can ( be ( approximated ( with ( ( squares and ) triangles ) ) ) ) ) ) ) ) ) ( ( three ( dimensional objects ) ) ( ( can ( ( ( ( be ( approximated ( with ( rectangular bricks ) ) ) ) and ) ( also ( ( with octahedron ) - ) ) ) ( tetrahedron bricks ) ) ) . ) ) )
(ROOT (S (SBAR (RB Just) (IN as) (S (NP (NP (DT the) (NN shape)) (PP (IN of) (NP (DT the) (NN letter)) (X (SYM e)))) (ADVP (RB above)) (VP (MD can) (VP (VB be) (VP (VBN approximated) (PP (IN with) (NP (NNS squares) (CC and) (NNS triangles)))))))) (NP (CD three) (JJ dimensional) (NNS objects)) (VP (MD can) (VP (VP (VB be) (VP (VBN approximated) (PP (IN with) (NP (JJ rectangular) (NNS bricks))))) (CC and) (PRN (ADVP (RB also)) (PP (IN with) (NP (NN octahedron)) (: -))) (VP (VB tetrahedron) (NP (NNS bricks))))) (. .)))
Just as the shape of the letter e above can be approximated with squares and triangles three dimensional objects can be approximated with rectangular bricks and also with octahedron- tetrahedron bricks.
(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)))))) (. .)))