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There can be any number of arguments to an operator. Most LISP functions require a fixed number of arguments. Some operators take an unlimited number of arguments.
TOP LEVEL
The top level of LISP is the place where LISP has finished all pending evaluations and is waiting for new input from the user.
FUNCTIONS
LISP is somewhat unusual in that virtually everything gets done by executing a function. There is really no more to LISP than that. All the complexity of LISP comes from the particular functions LISP provides and the details of how various types of functions are treated by the interpreter.