( ( The ( MERGED atom ) ) ( ( ( ( has ( coordinates ( of ( ( the ( arithmetic middle ) ) ( of ( the pair ) ) ) ) ) ) and ) ( ( keeps all ) ( ( covalent ( BOND connections ) ) ( to ( ( the rest ) ( of ( the atoms ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP MERGED) (NN atom)) (VP (VP (VBZ has) (VP (VBN coordinates) (PP (IN of) (NP (NP (DT the) (NN arithmetic) (NN middle)) (PP (IN of) (NP (DT the) (NN pair))))))) (CC and) (VP (VBZ keeps) (RB all) (VP (VB covalent) (NP (NN BOND) (NNS connections)) (PP (TO to) (NP (NP (DT the) (NN rest)) (PP (IN of) (NP (DT the) (NNS atoms)))))))) (. .)))
The MERGED atom has coordinates of the arithmetic middle of the pair and keeps all covalent BOND connections to the rest of the atoms.
(ROOT (S (NP (DT A) (NN covalent) (NN network)) (ADVP (RB solid)) (VP (VBZ is) (NP (NP (DT a) (NN compound)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (NP (DT all)) (PP (IN of) (NP (DT the) (NNS atoms)))) (VP (VBP are) (VP (VBN connected) (PP (TO to) (NP (CD one) (DT another))) (PP (IN by) (NP (JJ covalent) (NNS bonds))))))))) (. .)))