There is no simple independent word for brain. A personal prefix goes with the dependent noun stem /=iinindib-/ body to make a full word:
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niinindib my brain (1s-0s)
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giinindib your brain (2s-0s)
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wiinindib h/ brain (3s-0s); some people have an alternate form owiinindib
Some basic forms of wiinindib h/ brain are: