Function to return the unique contents of the column given the column name
getConentdInCols(data, colname)
a data frame
name of column corresponding to year of birth
the contents of the column, if success -1 if failure
# NOT RUN { getConentdInCols(data.frame("yob" = c(1951,1980), "Name" = c("John","Dora")),"yob") # }
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