You will be given a definition of a task first, then some input of the task.
From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.

Given Relationship: 'celebrate', Sentence: 'Americans celebrate the Thanksgiving holiday on the fourth Thursday of November , with the Friday after being also an unofficial day off from work for many known as " Black Friday . "'
Output:
celebrate