Given an undirected graph, determine if there is a path from one node to another.
The input consists of one or more graph specifications. Each
specification consists of three parts. The first part is a line with
the source and target nodes, separated by one space. The second part
is a line consisting of integer n, the number of edges in the graph.
The third part consists of n edges. Each edge is given on a line
and consists of a pair of nodes separated by spaces. All nodes are integers.
For each graph, output true when there is a path between
the source and target nodes, output false otherwise.
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