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Find cycle in indirected graph

This questions was asked by Amazon.

Description

Given a list of vertices in a graph, implement a function that detects cycles in this graph.

Example

Input:
  a, b, c = Node('a'), Node('b'), Node('c')
  a.add_edge(b)
  b.add_edge(c)

  has_cycle([a,b,c]) # False

  c.add_edge(a)
  has_cycle([a,b,c]) # True