( Fermat ( ( ( 's ( Principle ( of ( Least Time ) ) ) ) again ) ; ) )
(ROOT (S (NP (NNP Fermat)) (VP (VBZ 's) (NP (NP (NNP Principle)) (PP (IN of) (NP (NNP Least) (NNP Time)))) (ADVP (RB again))) (: ;)))
Fermat's Principle of Least Time again;
(ROOT (S (NP (NP (NNP Fermat) (POS 's)) (NN principle)) (VP (VBZ states) (SBAR (IN that) (S (NP (NN light)) (VP (MD will) (ADVP (RB always)) (VP (VB take) (NP (NP (DT the) (NN path)) (PP (IN of) (NP (NP (DT the) (JJS least) (NN amount)) (PP (IN of) (NP (NN time))))))))))) (. .)))