(U-0002493C): Unify M-20979.

(U-0002493C): Unify M-20979.
(U+73EF): Add `ideographic-structure'; add representative nodes.
(U+7470): Add ideographic-structure.
(U-00024A5E): Likewise.
(U-0002DE8A): New character; unify CB02413.
(U+74CA): Add `ideographic-structure'.
(o-UU+74CA): Use `->subsumptive' instead of `->denotational'.
(A-CU+2F932): New abstract node; use `<-denotational' for U+74CA.
(MJ017497): Use A-CU+2F932 instead of U+74CA as its mother.
(U-0002F932): New character; use `<-denotational' for A-CU+2F932.