3 2 GfsSimulation GfsBox GfsGEdge {} {
	GfsTime { end = 3 }
	GfsRefine 6
	GfsOutputTime         { istep = 10 } stdout
	OutputSimulation      { start = end } end.gfs
}
GfsBox { left  = GfsBoundaryInflowConstant 1 }
GfsBox { }
GfsBox { top = BoundaryOutflow }
1 2 right
2 3 top