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https://issues.apache.org/jira/browse/LANG-588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12832176#action_12832176
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Paul Benedict commented on LANG-588:
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They are type parameters. They correspond to type parameter 1 and type 
parameter 2.

> Create a basic Pair<L, R> class
> -------------------------------
>
>                 Key: LANG-588
>                 URL: https://issues.apache.org/jira/browse/LANG-588
>             Project: Commons Lang
>          Issue Type: New Feature
>          Components: lang.*
>            Reporter: Matt Benson
>             Fix For: 3.0
>
>         Attachments: Pair.java, PairTest.java
>
>
> [lang] is the perfect place to provide a basic typed Pair class.  I have 
> written such a class for my employer (who hasn't?) but can/will rewrite blind 
> to avoid IP issues.  I think it's also nice to go ahead and extend this to 
> MatchedPair<T> extends Pair<T, T> as well.

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