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- Mary went to the bathroom. Fact 2- John travelled to the hallway. Fact 3- John moved to the kitchen. Fact 4- Mary went back to the hallway. Fact 5- Daniel went back to the bedroom. Fact 6- Mary journeyed to the garden. Fact 7- Mary went back to the office. Fact 8- Daniel went back to the bathroom. Fact 9- Sandra moved to the hallway. Fact 10- John went back to the bedroom. Question: Where is Mary? Answer: office
Fact 7

Passage: Fact 1- Sandra moved to the office. Fact 2- John went to the kitchen. Fact 3- John travelled to the garden. Fact 4- Mary moved to the office. Question: Where is Mary? Answer: office
Fact 4

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

Fact 4