The 13 months in the Igbo calender - Onwa iri n'ato enwere na ogu aro Igbo;
Onwa Mbu
Onwa Abuo
Onwa Ife Eke
Onwa Ano
Onwa Agwu
Onwa Ifejioku
Onwa Alom Chi
Onwa Ilo mmuo
Onwa Ana
Onwa Okike
Onwa Aja Ana
Onwa Ede Aja Ana
Onwa Uzo Alusi
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They're all ritually backed up, which most of us don't know.
If you don't know them, no need worrying yourself, all you need to do is make sure you perform your igo ofo ututu ritual in that first day of the new month to claim whatever good it will bring.