Table 1. Word increasing rate for each phase

	Read-aloud style		Conversational style
Phase	Token	Type	Token	Type
1	75,209	12,988	54,934	7,097
2	150,951	19,939	100,202	10,447
3	226,200	24,987	146,725	13,063
4	302,383	29,393
5	402,958	34,743