1.2.8 Calling built-in functions

Call built-in functions by using the function name followed by a comma-separated list of parameters in parentheses. A parameter can be a single value or an expression.
For convenience, a function that does not have parameters can be called by its name, if the name does not match the name of any variable in the code. An empty pair of parentheses can be appended but is not mandatory.
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