Appox. usage (any sense): 166 per million words
Appox. usage (any sense): less than 0.1 per million words
Usage unknown
Appox. usage (any sense): less than 0.1 per million words
Appox. usage (any sense): 166 per million words
Appox. usage (any sense): less than 0.1 per million words
Usage unknown
Appox. usage (any sense): less than 0.1 per million words