Matched context for stroke and retract

The page lists matched contexts for stroke and retract.

Share - stroke	Share - retract	Phrase
21.58%	6.93%	{stroke or retract} piston [perform operation]
8.03%	3.28%	{stroke or retract} plunger [perform operation]
10.08%	2.06%	piston [does] {stroke or retract}
7.30%	0.48%	{stroke or retract} position [perform operation]