my blog lives here now
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  1. \node[] (i1j0) at (1, -1) {P};
  2. \node[] (i1j1) at (1, 1) {C};
  3. \node[] (i0j0) at (-1, -1) {B};
  4. \node[] (i0j1) at (-1, 1) {A};
  5. \draw[<-] (i0j0) -- (i0j1) node [midway] {$f$};
  6. \draw[->] (i0j0) -- (i1j0) node [midway, below] {$i_1$};
  7. \draw[->] (i0j1) -- (i1j1) node [midway] {$g$};
  8. \draw[<-] (i1j0) -- (i1j1) node [midway, right] {$i_2$};