You will be given a definition of a task first, then some input of the task.
In this task, you're given two sentences. Indicate if the first sentence clearly entails the second sentence (i.e., one can conclude the 2nd sentence by reading the 1st one). Indicate your answer with '1' if the first sentence entails the second sentence, otherwise answer with '0'.

Sentence 1: The spread of AIDS in Africa is driven not by unsafe sex but by unsafe medical practice, according to research published last week. Sentence 2: AIDS spreads in Africa.
Output:
1