original_query: What is the purpose of the suffix -(e)l in Pinyin?
query: What is the purpose of the suffix -(e)l in Gwoyeu Romatzyh?
answer: In Gwoyeu Romatzyh, the suffix -(e)l corresponds to Pinyin -er and functions as a rhotacization suffix, as in 'ideal = i dean + -(e)l, "a little" (yìdiǎnr).