Anchor: There would be a policeman about somewhere not that he really wanted to invoke the aid of the police if he could possibly do without it.
Entailed: He did not want to get the policeman involved.
Contradiction: He wanted the policeman to aid him as much as possible.
Contradiction: They have no idea what they're doing
Contradiction: It's better than nothing.
Contradiction: There are just five computers in the lab and every pupil in the school has to share them.
Contradiction: If computers stopped working and people had to use a typewriter, they'd be lost.