Use of begin

Use begin when you need to do multiple things in a place where a single form is required:

   (if (fire?)
       (begin (go-outside)
              (call-fire-dept) )
       (begin (get-beer)
              (turn-on-tv) ) )
The if special form requires a single form for the then and else parts, so a begin must be used if multiple things need to be done.

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