Monica has decided to create her own social network. And, obviously, she wants to show the content that is the most relevant to each user. In order to do that, she's created a graph that shows who befriends who. Additionally, the friends of your friends are also considered your friends in this scheme. A group, in which each two people are friends, is considered a 'friend group'.
Monica's theory is that she can recommend the things users like to other people in their friend groups.
Ian has recently liked a picture of kittens. List the users to whom this picture can be recommended.
Note: use space to separate the names.