[tag=NN] [tag="," | tag=NN] □
[tag=NN] [tag="," | tag=NN] [□]
[tag=NN] [tag="," | tag=NN] (□ | □)
I designed the C++ class QPerformanceTimer to avoid this annoyance . Cleaning up the world 's fuel supplies is a critical step towards reversing this situation - - not only do contaminants like lead in gasoline and sulfur in diesel fuel lead to air pollution that impairs health , but they are barriers to catalytic converters , particulate " traps " and other emission control technologies that can remove most of the pollution that comes from today 's vehicles . To try to make a little more of a link , let me submit that it strikes me there are two things you can do - - there is a two step strategy to improving the Federal workforce . Dr. Robert Preece , a gamma-ray astrophysicist at the University of Alabama in Huntsville , likened the shock wave to a wave on the beach .