1.   After the first two weeks of prednisolone, the daily dosage was steadily reduced to zero over the ensuing weeks.

2.   But when a plane is approaching a mountain, its height over the ground can be reduced to zero so quickly that the system cannot provide adequate warning.

3.   If the lag time can essentially be reduced to zero, so should the sickness.

4.   Tariffs on almost all products traded by member states would be reduced to zero to five percent.