PlantUML: How to define use case?

Use cases are defined by

a.   enclosing the use case name in parenthesis.

b.   Using usecase keyword.

 

createUsecase.txt

@startuml
(Login)

(Check tickets availability) as CTA

usecase (Book Ticket)

usecase (Print ticket) as PT

@enduml

 

Above snippet generate below image.

 

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