Definition: In this task, you will be given a short story. One sentence from the story is chosen. Consider the events that happen before that sentence, or are likely to have happened before it. Does any of them directly cause it, or simply make it possible? You should write your answer in the form " A >causes/enables> B". Try to use phrases and sentences from the story to compose your answer when possible.
Input: story: Tre went out for a pleasant walk in the evening air. It was a perfect evening, and Tre felt very happy. He came upon a group of friends, and enjoyed their company. Tre stopped by the store and bought a soda and some skittles. He then continued on his way home.
 selected sentence: He came upon a group of friends, and enjoyed their company.

Tre went out for a pleasant walk in the evening air >Causes/Enables> He came upon a group of friends