( ( The ( innermost core ) ) ( ( is ( ( the '' ) ( filler '' ) ) ) . ) )
(ROOT (S (NP (DT The) (NN innermost) (NN core)) (VP (VBZ is) (NP (NP (DT the)) ('' '') (VP (VBN filler) ('' '')))) (. .)))
The innermost core is the &quot; filler &quot;.
(ROOT (S (NP (NP (DT The) (JJ innermost) (NN layer)) (PP (IN of) (NP (DT the) (NN sun)))) (VP (VBZ is) (VP (VBN known) (PP (IN as) (NP (DT the) (NN core))))) (. .)))