# File warshall.rb, line 351
        def setup
                @rel1 = Relation.new([[1,1],[1,2],[2,3],[2,1],[4,4]])
                @rel2 = Relation.new([[1,2],[2,3],[3,4],[2,5]])
                @rel3 = Relation.new([[1,2],[2,3],[3,4],[2,5],[5,5]])
                @rel4 = Relation.new([[1,1],[2,2],[3,3],[4,4]])
        end