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digraph G {	
	node [shape=circle];
	a_1 [texlbl="$x^2+\frac{\sin y}{y^2+\cos \beta}+\gamma_3$"];
	a_1 -> a_2 [label=" ", texlbl="$x_1+x_3^2+z+c+v~~$"];
	a_2 -> a_1;
}