new_dataframe <- subset(mydata,County=="Dublin City" | County=="South Dublin" | County=="Dún Laoghaire-Rathdown")
# check new dataframe
head(new_dataframe)
County Population
13413 South Dublin 203
13414 South Dublin 170
13415 South Dublin 101
13416 Dún Laoghaire-Rathdown 141
13417 Dún Laoghaire-Rathdown 121
13418 Dún Laoghaire-Rathdown 223
> tail(new_dataframe)
County Population
18483 Dublin City 152
18484 Dublin City 96
18485 Dublin City 150
18486 Dublin City 238
18487 Dublin City 360
18488 Dublin City 343
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