¥documentclass[dvipdfmx]{standalone}¥usepackage{tikz}¥usetikzlibrary{shapes, positioning,arrows,automata}¥begin{document}¥begin{tikzpicture}[->, auto,thick]¥node[state, fill=gray, text=white] (a1) {$¥alpha_1$}; ¥node[state, fill=gray, text=white][right = of a1] (a2) {$¥alpha_2$}; ¥node[state, fill=gray, text=white][right = of a2] (a3) {$¥alpha_3$}; ¥node[state, fill=gray, text=white][right = of a3] (aT) {$¥alpha_T$};; ¥node[state][below = of a1] (y1) {$y_1$}; ¥node[state][below = of a2] (y2) {$y_2$}; ¥node[state][below = of a3] (y3) {$y_3$}; ¥node[state][below = of aT] (yT) {$y_T$}; ¥path[->](a1) edge (a2); ¥path[->](a2) edge (a3); ¥path[->](a3) edge[dotted] (aT); ¥path[->](a1) edge (y1); ¥path[->](a2) edge (y2); ¥path[->](a3) edge (y3); ¥path[->](aT) edge (yT); ¥end{tikzpicture}¥end{document}