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9 lines
369 B
9 lines
369 B
\node (fi0j1) at (-0.75,0.75) {$a$};
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\node (fi0j0) at (-0.75,-0.75) {$b$};
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\node (fi1j1) at (0.75,0.75) {$c$};
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\node (fi1j0) at (0.75,-0.75) {$d$};
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\draw[->] (fi0j1) -- (fi1j1) node[midway] (f) {f};
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\draw[->] (fi0j0) -- (fi1j0) node[midway,below] (g) {g};
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\draw[<-] (fi0j0) -- (fi0j1) node[midway,left] (p) {p};
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\draw[<-] (fi1j0) -- (fi1j1) node[midway,right] (q) {q};
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