Hi all,
I have a dataframe that has one observation per case.
for example:

Case    Startyear      Endyear
   A           1979              1989
   B           1950              1955

I would like to create a dataframe in which each case has
multiple observations corresponding to the start and end year
for example

Case     Year
  A          1979
  A          1980
  A           1981
.                   .
.                   .
.                   .
  A            1989
  B            1950
  B             1951
and so on



any help would be greatly appreciated.

Joe

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