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How do I merge the years collumns so that there are no duplicates of years in R studio? For example, in the whole data set,

How do I merge the years collumns so that there are no duplicates of years in R studio? For example, in the whole data set, there are years ranging from

1978

1984

in the rows. How do I merge the data so that there are no duplicates of

1978, 1979

and so on

.

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