dot -Tsvg  graph1.gv > graph1.svg
dot -Tsvg  graph2.gv > graph2.svg
dot -Tsvg  graph3.gv > graph3.svg
dot -Tsvg  graph4.gv > graph4.svg
dot -Tsvg  graph5.gv > graph5.svg
dot -Tsvg  graph6.gv > graph6.svg
dot -Tsvg  graph7.gv > graph7.svg
dot -Tsvg  graph8.gv > graph8.svg