What other words can double like चलते -> चलते चलते?
I see that certain words are sometimes said twice like चलते चलते, जल्दी जल्दी, कौन कौन, क्या क्या, etc. Sometimes this changes the meaning and sometimes it just emphasizes the meaning.
कौन = Who?
कौन कौन = Who all?
What are some other words that often double like this and what do they mean?