Observe the various tests performed in the District's lab, which help insure safe drinking water.
(the various tests performed in the District's lab; help; insure safe drinking water) Context(the various tests performed in the District 's lab help,List([8, 69))):(the various tests performed in the District's lab; help insure; safe drinking water)
the various tests performed in the District 's lab help,List([8, 69))
the various tests performed in the District's lab the various tests performed in the District's lab
help help insure
insure safe drinking water
safe drinking water