( ( Strange matter ) ( ( is ( ( a ( degenerate gas ) ) ( of ( quarks ( that ( ( is often ) ( assumed ( to ( ( contain ( ( strange quarks ) ( in addition ) ) ) ( to ( the ( ( usual ( ( up and ) down ) ) quarks ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Strange) (NN matter)) (VP (VBZ is) (NP (NP (DT a) (JJ degenerate) (NN gas)) (PP (IN of) (NP (NP (NNS quarks)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (ADVP (RB often)) (VP (VBN assumed) (S (VP (TO to) (VP (VB contain) (NP (NP (JJ strange) (NNS quarks)) (PP (IN in) (NP (NN addition)))) (PP (TO to) (NP (DT the) (ADJP (JJ usual) (ADVP (RB up) (CC and) (RB down))) (NNS quarks)))))))))))))) (. .)))
Strange matter is a degenerate gas of quarks that is often assumed to contain strange quarks in addition to the usual up and down quarks.
(ROOT (S (NP (DT A) (NN gas)) (VP (VBZ assumes) (NP (NP (DT the) (NN shape)) (PP (IN of) (NP (PRP$ its) (NN container))))) (. .)))