# Are there any radicals with immutable position in kanji?

Reading Is there a difference in drawing between the "mouth" and "enclosure" kanji radicals? made me think: does 囗 (enclosure) have to be the outermost radical? Apparently the answer is "no" since we have this (incomplete) list of exceptions: 烟姻廻咽個恩悃迴. It also seems to happen with other "enclosure type" radicals, e.g. 厂->板 or 广 -> 俯, but are there any radicals that can only be in a specific position in the kanji and nowhere else?

• @siikamiika: Sorry, but I'm not sure how that link is relevant to my question. Can you please explain? Apr 6, 2017 at 21:59
• Given that you can pile kanji like that to form new characters, nothing prevents you from eliminating a supposed outermost radical by placing something next to it. If you limit yourself to kanji included in some list like 常用漢字, it is possible to use something like KanjiVG to determine which radicals only enclose kanji and not part of a horizontal or vertical shape kanji or which radicals only appear as the left/right or top/bottom radical and are not enclosed or eliminated from the top level by a horizontal or vertical radical (this explanation is convoluted but I hope you get what I mean) Apr 6, 2017 at 22:15
• Does this answer your question? I can post the previous comment as an answer Apr 6, 2017 at 22:27