my blog lives here now
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\node[] (i0j1) at (-1, 1) {A};
\node[] (i1j1) at (1, 1) {C};
\node[] (i0j0) at (-1, -1) {B};
\draw[<-] (i0j0) -- (i0j1) node [midway] {$f$};
\draw[->] (i0j1) -- (i1j1) node [midway] {$g$};