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[ A ] { flow: south; size: 5,1; }
[ B ] { offset: 0,2; origin: A; }
[ C ] { offset: 2,0; origin: B; }
[ D ] { offset: 2,0; origin: C; }
[ E ] { offset: 2,0; origin: A; }

[ A ] <--> [ B ]
[ A ] <--> [ C ]
[ A ] <--> [ D ]
[ B ] <--> { end: south, 0; start: south; } [ E ]
[ C ] <--> { end: south, 0; start: south; } [ E ]
[ D ] <--> { end: south, 0; start: south; } [ E ]