@startuml
left to right direction
:Cliente:

"Meter dinero" as (meter)
"Pedir azucar" as (azucar)
"Pedir producto" as (producto)
"Cancelar" as (cancelar)
"Devolver dinero" as (devolver)

Cliente --> (meter)
Cliente --> (azucar)
Cliente --> (producto)
Cliente --> (cancelar)

(producto) .. (devolver) : <<include>>
(cancelar) .. (devolver) : <<include>>
@enduml