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There are generally small kanji on a japanese calligraphy (shodo) work. Sometimes they are written above an inkan or inkan set. What are these kanji for? What types of information is written like this conventionally? Is this a necessary part of a shodo work? I think they contain some meta information about the work but I'm not sure.
Example image is below. 
that's a signature. (usually the name of the calligrapher)
