Counting definitions is a start.
( ( Counting definitions ) ( ( is ( a start ) ) . ) )
(ROOT (S (NP (JJ Counting) (NNS definitions)) (VP (VBZ is) (NP (DT a) (NN start))) (. .)))
A start is counting definitions.
( ( A start ) ( ( is ( counting definitions ) ) . ) )
(ROOT (S (NP (DT A) (NN start)) (VP (VBZ is) (VP (VBG counting) (NP (NNS definitions)))) (. .)))