Aspects of this topic are discussed in the following places at Britannica.
...five). In the New Guinea area several Austronesian languages have radically restructured number systems that probably result from intensive contact with neighbouring Papuan languages. An example is Gapapaiwa of Milne Bay, with sago ‘one,’ rua ‘two,’ rua ma sago ‘three’ (literally, ‘two and one’), rua ma rua ‘four,’ rua ma rua ma...
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