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ô has a long sound, almost—u, as in the verb to go, or rather in to prove; ex: mô (particle, formative of active verbs); pô, the hand.
ò has a sound, like the diphthong aw in the word—law; ex: sòkò, Brasilian bird; ikò, to be, (=Port. estar).
õ has, finally, a nasal sound, as the Port.compound—on; ex:—mõdá, to steal.
U
u (unmarked) has a short sound, like u in full; ex: mu, brother.
û has a long sound, something like oo in too (adv.) ex: tasûba, fever.
ŭ has a very peculiar sound, something like the German ü, or rather the Greek v; ex : mŭra, wood.
«This sound of ŭ is, generally, represented by the grammarians of the Brasilian language by y. which they have called the full i.»
ũ has, finally, a nasal sound, like the Port. compound—um; ex: pitũna, night (dark or black.)