We can calculate social distances between people using matrices. For example, people you like are a social distance of 1 from you. People your friends like are a social distance of 2 from you. A person can be a social distance of 1 and 2 from you if you like them and have a friend who also likes them.

A² computes social distances of 2. Compute A².

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0 100 0 10000 1 101 1 1000 1 001 0 1