Language name and locationː Aro, Papua New Guinea [Refer to Ethnologue]
语言名称和分布地区: 阿罗语, 巴布亚新几内亚东锡皮克省及桑道恩省

1. latən

2. wiyeu

3. awɨyāl

4. wiyeu wiyeu (lit. means ‘two two’)

5. əndal wombuk (lit. means ‘hand side’)

6. əndal wombuk latən (lit. means ‘hand side one’)

7. əndal wombuk wiyeu (lit. means ‘hand side two’)

8. əndal wombuk awɨyāl (lit. means ‘hand side three’)

9. əndal wombuk wiyeu wiyeu (lit. means ‘hand side two two’)

10. əndal wombuk wombuk (lit. means ‘hand side side’)

11. əndal wombuk wombuk latən (lit. means ‘hand side side one’)

12. əndal wombuk wombuk wiyeu (lit. means ‘hand side side two’)

13. əndal wombuk wombuk awɨyāl (lit. means ‘hand side side three’)

14. əndal wombuk wombuk wiyeu wiyeu (lit. means ‘hand side side two two’)

15. əndal wombuk wombuk are wombuk (lit. means ‘hand side side foot side’)

16. əndal wombuk wombuk are wombuk latən

     (lit. means ‘hand side side foot side one’)

17. əndal wombuk wombuk are wombuk wiyeu

     (lit. means ‘hand side side foot side two’)

18. əndal wombuk wombuk are wombuk awɨyāl

    lit. means ‘hand side side foot side three’)

19. əndal wombuk wombuk are wombuk wiyeu wiyeu

    (lit. means ‘hand side side foot side two two’)

20.  əndal wombuk wombuk are wombuk wombuk
    (lit. means ‘hand side side foot side side’) 

Linguist providing data and dateː Mr. Andrey Drinfeld, PhD student, Department of Linguistics, University of Buffalo, New York, USA, November 4, 2021.
提供资料的语言学家: Mr. Andrey Drinfeld, 2021 年 11 月 4 日.

Other comments: Aro is spoken by approximately 500 speakers in Maprik district,

East Sepik province and west of Kombio, Sandaun province, Papua New Guinea. Aro has two words for numerals and they can count up to 20 with hands and feet. Aro is spoken in Maprik district, East Sepik province and Sandaun province, Papua New Guinea.
Note: In theory, the counting system in Aro allows for formation of numbers larger than 20 by means of recursive alternation of ‘hand side side’ and ‘foot side side’. Thus, 30 would be ‘hand side side foot side side hand side side’, 40 would be ‘hand side side foot side side hand side side foot side side’, 50 would be ‘hand side side foot side side hand side side foot side side hand side side’, etc. However, I was told that in practice Aro people in the past did not normally use words for numbers higher than 20. Instead, in the rare instances when they had to deal with large numbers (such as for the purpose of knowing how many pigs a hunter had killed over the course of his life), people kept pile of counting sticks, adding one stick to the pile each time one additional unit had to be counted, and looked at the pile to get an approximate idea of how much of something there was.