Good fences make good neighbors.
      -- Robert Frost (old New England saying)

A combination or function call in Scheme is a list of a function name followed by arguments of the function. A list is written by enclosing the elements of the list in parentheses.

   (+ x y)

   (sqrt x)

   (+ (* x x) (* 3 x) 2)

   (write "Dear Dad: Please send money!")

Combinations can be nested, as shown in the third example above. The arguments of a function are evaluated before the function is called, so innermost expressions are evaluated first.

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