dot -Tsvg  06-graph1-pre.gv > 06-graph1-pre.svg
dot -Tsvg  06-graph1-post.gv > 06-graph1-post.svg
dot -Tsvg  06-graph2-pre.gv > 06-graph2-pre.svg
dot -Tsvg  06-graph2-post.gv > 06-graph2-post.svg
dot -Tsvg  06-graph3-nonconst.gv > 06-graph3-nonconst.svg
dot -Tsvg  06-graph3-nonconst-peephole.gv > 06-graph3-nonconst-peephole.svg
dot -Tsvg  06-graph3-true.gv > 06-graph3-true.svg
dot -Tsvg  06-graph3-false.gv > 06-graph3-false.svg
dot -Tsvg  06-graph4-nonconst.gv > 06-graph4-nonconst.svg
dot -Tsvg  06-graph4-true.gv > 06-graph4-true.svg
dot -Tsvg  06-graph4-arg2.gv > 06-graph4-arg2.svg