Matched context for index and selectivity

The page lists matched contexts for index and selectivity.

Share - index	Share - selectivity	Phrase
1.25%	20.04%	high [size] {index or selectivity}
0.87%	15.03%	improve {index or selectivity} [perform operation]
1.34%	8.52%	have {index or selectivity} [perform operation]
0.24%	38.58%	catalyst {index or selectivity}
0.24%	17.81%	improved [effectiveness] {index or selectivity}