1.   A manual typewriter is physically harder to use than an electric keyboard.

2.   And the manslaughter charges were much more believable, and would be harder to fight.

3.   And the new bit was even harder to tell.

4.   Answers about personal qualities and abilities are harder to interpret, although experience does make it easier.

5.   As production methods improved the clinker produced was harder and the cement had to be more finely ground.

6.   Astronauts discovered that finding their way about on the lunar surface was often harder then they expected.

7.   Because many diesel trucks travel across state lines and are registered outside Arizona, they are harder to regulate than gasoline-powered vehicles.

8.   But brand loyalty is harder to win in the information and entertainment businesses.

9.   But power for activities in the belt and for propulsion of spacecraft is harder to find.

10.   But where a Decision affects everyone in general and no one in particular it is much harder to define sufficient interest.