COMBINE will consider NIL as other symbols as the singleton containing them, instead of the empty set.

Author Pascal J. Bourguignon <pjb@informatimago.com>
Author date 2020-10-28 07:12:18
Author local date 2020-10-28 08:12:18 +0100
Committer Pascal J. Bourguignon <pjb@informatimago.com>
Committer date 2020-10-28 07:12:18
Committer local date 2020-10-28 08:12:18 +0100
Commit d858869df1832ea37e7793bf7199d614b889a4b4
Tree ec4f1ce44f99dabdbe378c1df51facf086f37ed5
Parent d28d48416af61f2bbfdab8a755ce2093c6a7e910
COMBINE will consider NIL as other symbols as the singleton containing them, instead of the empty set.
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