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4. [m Include a summary for part (1:) only. Next, imagine that the network pictured above is a community; each node is a person in the community and each Link denotes two people who know each other well. Everyone in the community is aware of a particular injustice, but a person will only speak out if at least half their neighbors speak out (neighbor here is meant in the network sense). (a) Describe what happens if A decides to speak out (who joins A in speaking out, who joins next, and so on...) speaking out ' joins (b) Describe what happens if F decides to speak out (who joins F in speaking out, who joins next, and so on...) speaking out ' joins (c) Describe what happens if D and 0' both decide to speak out