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11 lines
345 B
11 lines
345 B
\node (atop) at (-1, 0.5) {a};
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\node (abot) at (-1, -0.5) {a};
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\node (btop) at (1, 0.5) {b};
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\node (bbot) at (1, -0.5) {b};
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\draw[->] (atop) to[out=30,in=150] node[midway] (f) {f} (btop);
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\draw[->] (atop) -- (abot);
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\draw[->] (abot) to[out=-30,in=-150] node[midway,below] (g) {g} (bbot);
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\draw[->] (btop) -- (bbot);
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\node at (0, 0) {$\alpha$};
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