Tīpoka ki ngā ihirangi matua
Kimi Pārōnaki e ai ki f
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Aromātai
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Ngā Raru Ōrite mai i te Rapu Tukutuku

Tohaina

-7f^{-1-1}
Ko te pārōnaki o ax^{n} ko nax^{n-1}.
-7f^{-2}
Tango 1 mai i -1.