Buddha Abhidhamma - Ultimate Science - BuddhaNet

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vipàka upekkhà-santiraõa citta which forms the apàya pañisandhi
in the four apàya abodes.
All the 12 akusala cetanà, at pavitti-kàla, produce 7 akusala
vipàka cittas in the 11 kàma-planes. They produce 4 akusala vipàka
cittas with the exception of ghàna-vi¤¤àõa, jivhà-vi¤¤àõa and kàyavi¤¤àõa,
in 15 råpa-planes excluding asa¤¤àsatta realm.
2 Effects of Kàmàvacara-kusala Kammas
First there are two types of kàmàvacara-kusala kamma: dvihetuka
and tihetuka. Dvihetuka kamma is again divided into two subgroups:
ukkaññha and omaka. Similarly tihetuka kamma is divided
into two sub-groups: ukkaññha and omaka. So, taking all together,
we get 4 sub-groups:
Kàmàvacara Kusala Kamma (8)
Dvihetuka (4) Tihetuka (4)
ukkaññha (4) omaka (4) ukkaññha (4) omaka(4)
Now 4 ¤àõa-vippayutta mahà-kusala cittas give rise to 4
dvihetuka-mahà-kusala kammas whereas 4 ¤àõa-sampayutta mahàkusala
cittas give rise to 4 tihetuka-mahà-kusala kammas.
As the 4 dvihetuka-mahà-kusala kammas can be either omaka
or ukkaññha, we get
i 4 dvihetuka-omaka mahà-kusala kammas, and
ii 4 dvihetuka-ukkaññha mahà-kusala kammas.
Similarly, from 4 tihetuka-mahà-kusala kammas, we get
iii 4 tihetuka-omaka mahà-kusala kammas, and
iv 4 tihetuka-ukkaññha mahà-kusala kammas.