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See - Victorian Languages: A Late Survey: L.A. Hercus; p. 30, 2.3.1.2.2 (d) General oblique case - for using 'mambarr' as 'you might'.
Notes:
In the sentence - 'Mambarr tyerrika kurnwila.' (lit. - perhaps-you to stand snake-on) the 'arr' suffix for 'you' has been added to the initial adverb 'mamba' rather than the verb 'tyerrika' (to stand).