[R] Add column to dataframe based on code in other column

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Hi all,

I have a dataframe of users which contain US-state codes. 
Now I want to add a column named REGION based on the state code. I have
already done a mapping:

NorthEast <- c(07, 20, 22, 30, 31, 33, 39, 41, 47)
MidWest <- c(14, 15, 16, 17, 23, 24, 26, 28, 35, 36, 43, 52)
South <- c(01, 04, 08, 09, 10, 11, 18, 19, 21, 25, 34, 37, 42, 44, 45, 49,
51)
West <- c(02, 03, 05, 06, 12, 13, 27, 29, 32, 38, 46, 50, 53)
Other <- c(40, 48, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 94,
98, 99)

So for example:
Name    State_Code
Tom       20
Harry     56
Ben         05
Sally       04

Should become like:
So for example:
Name    State_Code REGION
Tom       20                   NorthEast
Harry     56                   Other
Ben         05                  West
Sally       04                   South

Could anyone help me with a clever statement?



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