'How do you make a horizontal class aggregation representation with text in plantuml?

I want to have the following in plantuml. enter image description here

What I currently have is:

enter image description here

which was generated from

@startuml
Pond o-  "o...*" Swan
@enduml

But it doesn't look very good, the text is squished in. How can I make it look better? I've already consulted this page: http://plantuml.com/class-diagram, but I am not finding anything that useful.



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