I'm not clear about showing the association between an actor and the usecase.

1.
actor1 writes a letter. 
----------------------
In the above case there are 2 actors: actor1 and letter
1 usecase: write letter

How does the usecase diagram looklike?

actor1-------->(write letter)----->letter

or

actor1<-------(write letter)<-----letter

or something else?


2. Is <<uses>> association replaced by <<include>> in UML standard? Can we still use 
<<uses>> in our usecase diagrams?

3. What about the name of the associations? Can we assign any name or it should be one 
of the standard association names(uses, include, includes etc.)? 

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