11.   The economic base of Sitcomville was hard to figure out for folks who lived in industrial towns with round-the-clock shift work.

12.   Shift work and overtime made it impossible for him to consider an evening or weekend program in the Pittsburgh area.

13.   The disputes on the railways concern a variety of issues including pay, disciplinary procedures and shift work.

14.   Earlier studies had linked shift work to miscarriages and low birth-weight babies.