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+\node[square] (index8) at (2.8, 1.4) {$3$};
+
+\node[square, color1] (input1)  at (0.0, 0.8) {$5$};
+\node[square, color1] (input2)  at (0.4, 0.8) {$1$};
+\node[square, color2] (input3)  at (0.8, 0.8) {$7$};
+\node[square, color1] (input4)  at (1.2, 0.8) {$2$};
+\node[square, color3] (input5)  at (1.6, 0.8) {$3$};
+\node[square, color3] (input6)  at (2.0, 0.8) {$2$};
+\node[square, color4] (input7)  at (2.4, 0.8) {$1$};
+\node[square, color4] (input8)  at (2.8, 0.8) {$3$};
+
+\node[square, color1] (output1)  at (0.8, 0.0) {$8$};
+\node[square, color2] (output2)  at (1.2, 0.0) {$7$};
+\node[square, color3] (output3)  at (1.6, 0.0) {$5$};
+\node[square, color4] (output4)  at (2.0, 0.0) {$4$};
+
+\draw[edge1] (index1) -- (input1);
+\draw[edge1] (index2) -- (input2);
+\draw[edge1] (index3) -- (input3);
+\draw[edge1] (index4) -- (input4);
+\draw[edge1] (index5) -- (input5);
+\draw[edge1] (index6) -- (input6);
+\draw[edge1] (index7) -- (input7);
+\draw[edge1] (index8) -- (input8);
+
+\draw[edge1] (input1) to[edge2] (output1);
+\draw[edge1] (input2) to[edge2] (output1);
+\draw[edge1] (input3) to[edge2] (output2);
+\draw[edge1] (input4) to[edge2] (output1);
+\draw[edge1] (input5) to[edge2] (output3);
+\draw[edge1] (input6) to[edge2] (output3);
+\draw[edge1] (input7) to[edge2] (output4);
+\draw[edge1] (input8) to[edge2] (output4);
+
+\end{tikzpicture}
+
+\end{document}