Matched context for presence and removal

The page lists matched contexts for presence and removal.

Share - presence	Share - removal	Phrase
2.87%	0.43%	catalyst {presence or removal}
0.57%	1.94%	water {presence or removal}
0.47%	0.31%	air {presence or removal}
0.36%	0.66%	component {presence or removal}
0.48%	0.20%	compound {presence or removal}
0.34%	1.11%	contaminant {presence or removal}
0.40%	0.28%	ensure {presence or removal} [perform operation]
0.22%	0.26%	fluid {presence or removal}
0.48%	0.34%	gas {presence or removal}
0.20%	0.58%	heat {presence or removal}
0.41%	1.49%	key {presence or removal}
0.28%	0.63%	oil {presence or removal}
0.28%	1.22%	require {presence or removal} [perform operation]
0.29%	0.24%	simultaneous [chronology] {presence or removal}
0.54%	0.28%	vapor {presence or removal}