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graph ex2p1a {
	node [texmode="math",shape="none"];
	I0 [label="I"];
	C0 [label="C"];
	if0 [label="if",texlbl="$\mathtt{if}$"];
	E0 [label="E"];
	then0 [label="then",texlbl="$\mathtt{then}$"];
	I1 [label="I"];
	happy [label="happy",texlbl="$\mathtt{happy}$"];
	C1 [label="C"];
	if1 [label="if",texlbl="$\mathtt{if}$"];
	E1 [label="E"];
	then1 [label="then",texlbl="$\mathtt{then}$"];
	I2 [label="I"];
	else1 [label="else",texlbl="$\mathtt{else}$"];
	I3 [label="I"];
	trippy [label="trippy",texlbl="$\mathtt{trippy}$"];
	foo [label="foo",texlbl="$\mathtt{foo}$"];
	bar [label="bar",texlbl="$\mathtt{bar}$"];
	I0 -- C0;
	C0 -- if0;
	C0 -- E0;
	C0 -- then0;
	C0 -- I1;
	E0 -- happy;
	I1 -- C1;
	C1 -- if1;
	C1 -- E1;
	C1 -- then1;
	C1 -- I2;
	C1 -- else1;
	C1 -- I3;
	E1 -- trippy;
	I2 -- foo;
	I3 -- bar;
}