Keyword Analysis & Research: what does valid thru mean

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what does valid thru mean	2	0.8	4803	39	25
what	0.59	0.4	6902	97	4
does	1.85	0.8	6812	99	4
valid	0.94	0.3	5003	60	5
thru	1.85	0.6	9672	69	4
mean	0.47	0.4	6870	33	4

Keyword	CPC	PCC	Volume	Score
what does valid thru mean	0.37	0.9	290	43