what's a [...] in the middle of my list?
repl gives me a [[1, 2, 4, [...], 5, 6, 7, 3, [...]]]. What are the list of dots?
The [...] usually means a list of unspecified elements. But to fully answer your question I need more context.
Were did you see this text? What language are you using? If it was an error what code did you write to get it?