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3D. function calls
A function call is a temporary suspension of the current code for a
jump to a function, this may be either a self-written function (PROC),
or a function provided by the system. The format of a function call
is the name of the function, followed by two parentheses () enclosing
zero to unlimited arguments, separated by commas ",". Note that arguments
to functions are again expressions. (see  6A ) on how to make your own
functions, (see  9A  and 10A)
on built-in functions. Examples: