[etni] Semi-formal letter?

Last minute confirmation:

A semi-formal letter (Mod. D) contains:

1) Sender's address 2) Date 3) Opening  4) Closing
Do I have that right? Or can the students simply use the informal letter format (i.e. date, opening, closing)? 

Thanks,

Tzvi
P.S. Please forgive me if this has been thrashed out already- I had put my subscription on hold and I can't find any list archives. 

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