( ( ( Our ( innermost core ) ) ( they ( ( do n't ) ( penetrate to ) ) ) ) ( , ( ( ( do n't ) see ) ( , ( ( ( do n't ) know ) . ) ) ) ) )
(ROOT (S (NP (NP (PRP$ Our) (JJ innermost) (NN core)) (SBAR (S (NP (PRP they)) (VP (VBP do) (RB n't) (VP (VB penetrate) (PP (TO to))))))) (, ,) (S (VP (VBP do) (RB n't) (VP (VB see)))) (, ,) (VP (VBP do) (RB n't) (VP (VB know))) (. .)))
Our innermost core they don't penetrate to, don't see, don't know.
(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))))) (. .)))