Use constant for data validation
Use constant for data validation

google/open-location-code,google/open-location-code,zongweil/open-location-code,bocops/open-location-code,google/open-location-code,google/open-location-code,zongweil/open-location-code,bocops/open-location-code,google/open-location-code,bocops/open-location-code,google/open-location-code,bocops/open-location-code,bocops/open-location-code,bocops/open-location-code,zongweil/open-location-code,google/open-location-code,google/open-location-code,google/open-location-code,zongweil/open-location-code,zongweil/open-location-code,zongweil/open-location-code,google/open-location-code,zongweil/open-location-code,zongweil/open-location-code,bocops/open-location-code,bocops/open-location-code,google/open-location-code,zongweil/open-location-code,zongweil/open-location-code,bocops/open-location-code,bocops/open-location-code,bocops/open-location-code,zongweil/open-location-code