Was Mark Twain one of the four great masters of short fiction?

Mark Twain was regarded as the most important person in the history of American literature. He wrote a large number of short stories in a humorous and satirical style, reflecting deeply on social reality. His short stories occupied an important position in the history of American literature and were hailed as the "pioneer of modern American literature." However, there are different opinions on whether Mark Twain is one of the "four great masters of short stories". Although many people regarded him as a master of short stories, the title of "Four Great Masters of Short Stories" was not generally accepted. This title usually referred to O Henry, Maurpassant, Tolstoy, and Dostoevsky. Mark Twain's short story works were numerous and unique. Although he was called the master of short stories, his creative achievements might not be outstanding compared to the other four masters. Therefore, there were different opinions on whether Mark Twain was one of the "Four Masters of Short Stories".