You will be given a passage with an enumerated set of facts, a question of form 'Where is <person_name>?', and its answer. The task is to identify a supporting fact that is necessary to answer the question. The output would be the corresponding fact number.

Passage: Fact 1- John moved to the garden. Fact 2- Daniel went back to the office. Fact 3- Sandra travelled to the office. Fact 4- Mary went back to the garden. Fact 5- Daniel went back to the hallway. Fact 6- Sandra travelled to the kitchen. Question: Where is Mary? Answer: garden
Fact 4
Fact 4 tells us that Mary went back to the garden..