3.3.1. 4 [ũ]

The nasal vowel [ũ] has two graphems as well: um and un. If un / um is followed by a consonant it is pronounced nasale. (This nasal by the way doesn't exist in French. The graphem un / um is not pronounced like an u nasale in French.)

IPA presentation graphem exemple
[ũ]um um (un), cumprir (to accomplish) ,
[ũ]un mundo (world)

There is a diphtong as well, but this diphtong is almost irrelevant, because there is only one word where it shows up.

IPA presentation example
[ũj] muito (much)

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