Matched context for prestress and retract

The page lists matched contexts for prestress and retract.

Share - prestress	Share - retract	Phrase
6.90%	6.93%	{prestress or retract} piston [perform operation]
15.97%	0.96%	{prestress or retract} spring [perform operation]
20.03%	0.78%	spring [temporal] {prestress or retract}
12.21%	1.06%	spring [does] {prestress or retract}
2.82%	2.66%	{prestress or retract} member [perform operation]
3.03%	0.63%	{prestress or retract} valve [perform operation]