id lastname  firstname address           sex postcode
2   "Smith"    "Gearge"  "12 Mainstreet"  NA  "1234 AB"
3   "Jonson"   "A."      "61 Mainstreet"  F   "1234 AB"
4   "Johnson"  "Charles" "61 Mainstr"     F   "1234 AB"
6   "Schwartz" "Ben"     "1 Main"         M   "6789 XY"
7   "Schwartz" "Anna"    "1 Eaststr"      F   "6789 XY"