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Because of lexical scoping, QUINTUPLE's N is distinct from DOUBLE's N.
Consequently, the rules for lexical scoping tell us to look in the parent contour, which happens to be the implicit global contour (which is also the only other contour in this example).
Under lexical scoping, every function has associated with it, as part of its definition, a parent contour.
This scheme is called lexical scoping because environments mirror the nesting structure of the code.
He was honored for "his general contributions to the development of Higher Order Symbolic Programming, principally for his advancement of lexical scoping in LISP.
Steele, who is cited for his contributions in developing Higher Order Symbolic Programming and advancing lexical scoping in LSIP.