Sentence 1: You can take safaris lasting from one to three days on camel, or by four-wheel-drive vehicle where all supplies are included, or simply head off on quad bikes for an afternoon of fun in the sand dunes.

Sentence 2: Four-wheel-drive vehicles and camels can both be used for safaris.
Is this second sentence entailed by the first?

Answer: yes

Sentence 1: Although his study of adolescents found reductions in risky behavior and alcohol-related harm, he was disappointed to find no effect on drinking.

Sentence 2: He studied adolescents and alcohol, starting at age 14.
Is this second sentence entailed by the first?

Answer: it is not possible to tell

Sentence 1: Apache war parties are never large.

Sentence 2: The war parties are always small.
Is this second sentence entailed by the first?

Answer:
yes