\node[] (i0j0) at (-1, -1) {x};
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\node[] (i1j0) at (1, -1) {y};
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\node[] (i0j1) at (-1, 1) {x};
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\node[] (i1j1) at (1, 1) {z};
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\node (in) at (0, 0) {};
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\draw[->] (i0j0) -- (i0j1) node [midway] {$a$};
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\draw[->] (i0j0) -- (i1j0) node [midway, below] {$p(i)$};
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\draw[->,dashed] (i0j1) -- (i1j1) node [midway] {};
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\draw[->] (i1j0) -- (i1j1) node [midway, right] {$q(j)$};
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