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    use strict;
    use warnings;
...
    
        return @path;
    }

    Use of uninitialized value in hash element at euler.pl line 54

    $VAR = [5, 4, 3, 5, 2, 3, 1, 2, 4];

    def eulerPath(graph):
        # counting the number of vertices with odd degree
...
    
    stack_ = eulerPath({ 1:[2,3], 2:[1,3,4,5], 3:[1,2,4,5], 4:[2,3,5],
+ 5:[2,3,4] })
    print stack_