digraph example1 {
test1[label="test1"];
test2[label="test2"];
test3[label="test3"];
test4[label="test4"];
test5[label="test5"];
test6[label="test6"];
test2 -> test1[label=""];
test1 -> test3[label=""];
test4 -> test1[label=""];
test6 -> test5[label=""];
}