Unicode appears to define the composed forms of some radicals (e.g. 725C 牜or 2EA9 ⺩), but far from all (e.g. the left-half version of 6728 木). Yet there are texts (e.g. figure 18.7 in chapter 18 of the description of the Unicode standard (http://www.unicode.org/versions/Unicode12.0.0/ch18.pdf) ) which contains that character. Is there a collection of the encodings of the composed radical forms?