So-called semantic variants of (U+4E1F) and (U+4E22) are examples that Unicode gives as differing in a significant way in their abstract shapes, while Unicode lists and as z-variants, differing only in font styling. Paradoxically, Unicode considers and to be near identical z-variants while at the same time classifying them as significantly different semantic variants. There are also cases of some pairs of characters being simultaneously semantic variants and specialized semantic variants and simplified variants: (U+500B) and (U+4E2A). There are cases of non-mutual equivalence. For example, the Unihan database entry for (U+4E80) considers (U+9F9C) to be its z-variant, but the entry for does not list as a z-variant, even though was obviously already in the database at the time that the entry for was written.