Language/Volapuk/Grammar/genitive-and-dative-cases

The genitive and dative cases may be expressed in two ways, thus:

• de daut or dauta ‘of a/the daughter’
• de dauts or dautas ‘of daughters, of the daughters’
• ad daut or daute ‘to a/the daughter’
• ad dauts or dautes ‘to daughters, to the daughters’

Source: http://www.xn--volapk-7ya.com/quick-look-at-volapuk.html