Matched context for essential and possible

The page lists matched contexts for essential and possible.

Share - essential	Share - possible	Phrase
0.35%	0.25%	{essential or possible} to ensure
0.32%	1.57%	{essential or possible} to prevent
0.41%	0.96%	{essential or possible} to provide
1.04%	0.30%	course [attribute] {essential or possible}