( ( ( ( ( ( ( ( ( carbides ( -LRB- ( ( compounds ( of ( carbon ( and ( heavy metals ) ) ) ) ) -RRB- ) ) ) , ) ( nitrides ( -LRB- ( ( compounds ( of nitrogen ) ) -RRB- ) ) ) ) , ) ( borides ( -LRB- ( ( compounds ( of boron ) ) -RRB- ) ) ) ) , ) and ) ( silicides ( -LRB- ( ( compounds ( of silicon ) ) -RRB- ) ) ) ) . )
(ROOT (NP (NP (NP (NP (NNS carbides)) (PRN (-LRB- -LRB-) (NP (NP (NNS compounds)) (PP (IN of) (NP (NN carbon) (CC and) (JJ heavy) (NNS metals)))) (-RRB- -RRB-))) (, ,) (NP (NP (NNS nitrides)) (PRN (-LRB- -LRB-) (NP (NP (NNS compounds)) (PP (IN of) (NP (NN nitrogen)))) (-RRB- -RRB-))) (, ,) (NP (NP (NNS borides)) (PRN (-LRB- -LRB-) (NP (NP (NNS compounds)) (PP (IN of) (NP (NN boron)))) (-RRB- -RRB-))) (, ,) (CC and) (NP (NP (NNS silicides)) (PRN (-LRB- -LRB-) (NP (NP (NNS compounds)) (PP (IN of) (NP (NN silicon)))) (-RRB- -RRB-)))) (. .)))
carbides (compounds of carbon and heavy metals), nitrides (compounds of nitrogen), borides (compounds of boron), and silicides (compounds of silicon).
(ROOT (S (NP (NP (JJ Binary) (NNS compounds)) (PP (IN of) (NP (NP (NN carbon)) (PP (IN with) (NP (ADJP (RBR less) (JJ electronegative)) (NNS elements)))))) (VP (VBP are) (VP (VBN called) (NP (NNS carbides)))) (. .)))