@startuml

package server1 {
	horizon1 -down-> [vserver1]
	horizon1 -down-> [vserver2]
	[vserver1] -up-> horizon1
	[vserver2] -up-> horizon1
}
package server2 {
	horizon2 -down-> [vserver3]
	horizon2 -down-> [vserver4]
	[vserver3] -up-> horizon2
	[vserver4] -up-> horizon2
}
package server3 {
	horizon3 -down-> [vserver5]
	horizon3 -down-> [vserver6]
	[vserver5] -up-> horizon3
	[vserver6] -up-> horizon3
}
package server4 {
	horizon4 -down-> [vserver7]
	horizon4 -down-> [vserver8]
	[vserver7] -up-> horizon4
	[vserver8] -up-> horizon4
}
wormhole1 -down-> horizon1
wormhole1 -down-> horizon2
blackhole -down-> wormhole1
blackhole -down-> horizon1
blackhole -down-> horizon2

wormhole2 -down-> horizon3
wormhole2 -down-> horizon4
blackhole -down-> wormhole2
blackhole -down-> horizon3
blackhole -down-> horizon4
@enduml