Definition: 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'.
Input: Sentence 1: The Pharos, a monumental lighthouse built around 280 BC and standing 330 ft high, lit the entrance to Alexandria harbour for centuries, but archeologists have never been able to identify positively any remains. Sentence 2: The Pharos Lighthouse was located in Alexandria.

1