Iji nye onye ahịa anyị ngwaahịa zuru oke, anyị na-ejikwa njikwa mma atọ maka ma ngwaahịa ma nke na-abụghị nke ngwaahịa.
1. PQC: Njikwa Ogo Nhazi n'oge mmepụta
2. IQC: Njikwa Ogo na -abata mgbe emepụtara ya
3. OQC: Njikwa Ogo Ọpụpụ tupu ibugo