F x

F xF xF xF xF xF x
F xF xF xF xF xF x
F xF xF xF xF xF xF xF xF xF xF xF xF xF xF xF xF xF xF xF xF xF xF xF xF xF xF xF xF xF xF xF xF xF xF xF x