creating new new lines from column values

I'm struggling with one thing: I have an R dataframe with individual ID, entry year and exit year for each individual. It looks like: id Entry Exit 1 1988 1990 2 1986 1987 I need a new dataframe where the interval (entry, exit) is expanded into the years it contains, ie I need this: id Year 1 1988 1 1989 1 1990 2 1986 2 1987 I have not been able to create the right loop and I'd be very grateful for your help. Cheers

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