I want to know the answer to the following question:
What is commonly written with a single character formed by combining the last character with the radical of the first?
All the background I'm provided with is that "Less systematic examples include 圕 túshūguǎn "library", a contraction of 圖書館, A four-morpheme word, 社会主义 shèhuì zhǔyì "socialism", is commonly written with a single character formed by combining the last character, 义, with the radical of the first, 社, yielding roughly". Is that enough to answer the question?