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9 lines
336 B
9 lines
336 B
\node[] (i1j0) at (1, -1) {P};
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\node[] (i1j1) at (1, 1) {C};
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\node[] (i0j0) at (-1, -1) {B};
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\node[] (i0j1) at (-1, 1) {A};
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\draw[<-] (i0j0) -- (i0j1) node [midway] {$f$};
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\draw[->] (i0j0) -- (i1j0) node [midway, below] {$i_1$};
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\draw[->] (i0j1) -- (i1j1) node [midway] {$g$};
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\draw[<-] (i1j0) -- (i1j1) node [midway, right] {$i_2$};
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