\begin{tikzpicture}
	\begin{pgfonlayer}{nodelayer}
		\node [style=black node] (1) at (1, 0) {};
		\node [style=black node] (2) at (2, 0) {};
		\node [style=black node] (3) at (3, 0) {};
		\node [style=black node] (7) at (1, 4) {};
		\node [style=black node] (8) at (3, 4) {};
		\node [style=black node] (9) at (0, 3) {};
		\node [style=black node] (10) at (0, 1) {};
		\node [style=black node] (11) at (4, 1) {};
		\node [style=black node] (12) at (4, 3) {};
		\node [style=none] (14) at (5.5, 2) {=};
		\node [style=none] (30) at (8, 3.5) {};
		\node [style=none] (31) at (8, 4.5) {};
		\node [style=none] (32) at (10, 3.5) {};
		\node [style=none] (33) at (10, 4.5) {};
		\node [style=none] (34) at (10.5, 3) {};
		\node [style=none] (35) at (11.5, 3) {};
		\node [style=none] (36) at (10.5, 1) {};
		\node [style=none] (37) at (11.5, 1) {};
		\node [style=none] (38) at (10, 0.5) {};
		\node [style=none] (39) at (10, -0.5) {};
		\node [style=none] (40) at (9, -0.5) {};
		\node [style=none] (41) at (8, -0.5) {};
		\node [style=none] (42) at (8, 0.5) {};
		\node [style=none] (43) at (9, 0.5) {};
		\node [style=none] (44) at (7.5, 1) {};
		\node [style=none] (45) at (6.5, 1) {};
		\node [style=none] (46) at (6.5, 3) {};
		\node [style=none] (47) at (7.5, 3) {};
		\node [style=none] (48) at (0, -1) {};
		\node [style=none] (49) at (4, -1) {};
		\node [style=none] (50) at (5, 0) {};
		\node [style=none] (51) at (-1, 0) {};
		\node [style=none] (52) at (-1, 4) {};
		\node [style=none] (53) at (0, 5) {};
		\node [style=none] (54) at (4, 5) {};
		\node [style=none] (55) at (5, 4) {};
		\node [style=none] (56) at (6, 4) {};
		\node [style=none] (57) at (7, 5) {};
		\node [style=none] (58) at (11, 5) {};
		\node [style=none] (59) at (12, 4) {};
		\node [style=none] (60) at (11, -1) {};
		\node [style=none] (61) at (12, 0) {};
		\node [style=none] (62) at (7, -1) {};
		\node [style=none] (63) at (6, 0) {};
	\end{pgfonlayer}
	\begin{pgfonlayer}{edgelayer}
		\draw (31.center) to (30.center);
		\draw (33.center) to (32.center);
		\draw (34.center) to (35.center);
		\draw (36.center) to (37.center);
		\draw (38.center) to (39.center);
		\draw (43.center) to (40.center);
		\draw (42.center) to (41.center);
		\draw (44.center) to (45.center);
		\draw (46.center) to (47.center);
		\draw (54.center) to (49.center);
		\draw (53.center) to (48.center);
		\draw (51.center) to (50.center);
		\draw (52.center) to (55.center);
		\draw (57.center) to (62.center);
		\draw (63.center) to (61.center);
		\draw (58.center) to (60.center);
		\draw (59.center) to (56.center);
	\end{pgfonlayer}
\end{tikzpicture}
