(Commentary): Point to calendar.el.
(calendar-holiday-list, holiday-easter-etc): Simplify by using mapcar. (calendar-list-holidays): Return holiday-list. (list-holidays): Use let rather than let*. Remove un-needed locals `d', `never'. (calendar-check-holidays): Return result from dolist. (holiday-float): Use a single let*. Simplify if-and to and. (holiday-sexp, holiday-advent, holiday-greek-orthodox-easter): Use a single let*.
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