ohkawa et al. 1979

Keyword	CPC	PCC	Volume	Score	Length of keyword
ohkawa et al. 1979	1.47	1	3396	61	18
ohkawa	1.14	0.5	7383	18	6
et	0.1	0.2	1704	36	2
al.	0.49	0.3	6355	54	3
1979	1.18	0.7	1792	39	4

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