i have a digraph composed of many independant and simple subgraphs of various sizes. dot lays all these subgraphs horizontally, so i end up with a 40000x200 output file, e.g:

G1 G2 G3 G.....4 G5

How do i tell dot to layout these subgraphs in both dimensions to get something like:

G1 G2 G3
G.....4
G5

Thanks.

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