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Problem Statment: There are n servers numbered from 0 to n-1 connected by undirected server-to-server connections forming a network where connections[i] = [a, b] represents a connection between servers a and b. Any server can reach any other server directly or indirectly through the network.
A critical connection is a connection that, if removed, will make some server unable to reach some other server.
Return all critical connections in the network in any order.
2 /| / | / | 1 | | \ | | \| | 0 | 3
Input: n = 4, connections = [[0,1],[1,2],[2,0],[1,3]]
Explanation: [[3,1]] is also accepted.
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