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digraph "village metabolism" { size="8" "methane digester" [shape=hexagon]; "potable water", "food", "energy" [peripheries=2] ; "cattails" [color="#aaffaa",style=filled]; "grass" [color="#aaffaa",style=filled]; "sugar beets" [color="#aaffaa",style=filled]; "Sun" [color="yellow",style=filled]; "chickens" [color="tan",style=filled]; "compost worms" [color="tan",style=filled]; "pigs" [color="tan",style=filled]; "yeast" [color="tan",style=filled]; "Sun" -> "grass"; "Sun" -> "cattails"; "Sun" -> "sugar beets"; "grass" -> "chickens"; "grass" -> "pigs"; "sugar beets" -> "sugar"; "sugar beets" -> "chickens"; "sugar beets" -> "pigs"; "sugar" -> "yeast"; "chickens" -> "poop"; "chickens" -> "food"; "pigs" -> "poop"; "pigs" -> "food"; "poop" -> "compost worms"; "compost worms" -> "soil"; "compost worms" -> "chickens"; "soil" -> "grass"; "soil" -> "sugar beets"; "food" -> "humans"; "humans" -> "poop"; "yeast" -> "alcohol fuel"; "yeast" -> "DDGS"; "DDGS" -> "pigs"; "DDGS" -> "chickens"; "DDGS" -> "methane digester"; "methane digester" -> "methane"; "methane digester" -> "sludge"; "methane" -> "energy"; "alcohol fuel" -> "energy"; "sludge" -> "cattails"; "cattails" -> "starch"; "cattails" -> "potable water"; "cattails" -> "vegetable protein"; "vegetable protein" -> "food"; "starch" -> "yeast"; }