Matched context for purging and proportioning

The page lists matched contexts for purging and proportioning.

Share - purging	Share - proportioning	Phrase
2.20%	37.62%	{purging or proportioning} valve
8.38%	7.06%	{purging or proportioning} system
2.77%	10.23%	{purging or proportioning} device
3.03%	9.11%	{purging or proportioning} operation
3.86%	6.81%	{purging or proportioning} mode
3.91%	6.01%	{purging or proportioning} unit
3.65%	4.46%	{purging or proportioning} means