(A-compU+592C): New abstract node.

(A-compU+592C): New abstract node.
(U+592C): Add `<-denotational' for A-compU+592C; add
`<-denotational@usage' for A2-DJT-01950 and BUCS+592C.
(U-000215D2): Add `<-denotational' for A-compU+592C; add
`<-denotational@usage' for A2-DJT-01118 and A2-DJT-01950.
(A-IWDSU+5944): Move `<-denotational@usage' for BUCS+5944 to U+5944
and U-00021639.
(U+5944): Add `<-denotational@usage' for BUCS+5944.
(UU+5944): Unify DJT-01968.
(U-00020AFB): Add `sound@ja/on'.
(U-00021624): Add `<-denotational@usage' for BUCS+5944.
(IU+21624): Unify DJT-01991.
(U-00021639): Add `<-denotational@usage' for BUCS+5944.
(U-00021641): Add ideographic-structure.
(BUCS+592C): New abstract node.
(BUCS+5944): Unify A2-DJT-01968.
(A2-DJT-01950): New abstract node; use `<-denotational' for BUCS+592C.