@startmindmap
+ root
++ right
+++ right right
*** right2
-- left
--- left left
-- left2
@endmindmap

left to right direction
skinparam packageStyle rectangle
actor customer
actor clerk
rectangle checkout {
customer -- (checkout)
(checkout) .> (payment) : include
(help) .> (checkout) : extends
(checkout) -- clerk
}

class Car
Driver - Car : drives >
Car *- Wheel : have 4 >
Car -- Person : < owns

participant User
User -> A: DoWork
activate A
A -> B: << createRequest >>
activate B
B -> C: DoWork
activate C
C --> B: WorkDone
destroy C
B --> A: RequestCreated
deactivate B
A -> User: Done
deactivate A