| findAllDup | R Documentation | 
Using the base-R function duplicated will find the 2nd, 3rd, etc.
instance of a duplicate but not all instances of a duplicate.
findAllDup returns the locations of all duplicates.
findAllDup(x)
x | 
 A vector  | 
findAllDup(c("Lightning", "Theo", "Kiki", "Lightning"))
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