Buddha Abhidhamma - Ultimate Science - BuddhaNet

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Generally it may be said that the first mahà-kusala citta gives
result to the first mahà-vipàka citta, and the second mahà-kusala
citta to the second mahà-vipàka citta, etc.
Conditions for the arising of the mahà-kiriya cittas in arahats
are the same as those described for mahà-kusala cittas.
Normal Cittas in a Person
Although all the 54 types of kàmàvacara cittas can arise in persons
in the human abode, hasituppàda citta and the eight mahà-kiriya
cittas can occur only in arahats. So only 45 types of kàmàvacara
cittas arise in ordinary persons who are not arahats.
A person may further acquire 5 råpàvacara-kusala cittas (råpajhànas)
and 4 aråpàvacara-kusala cittas (aråpa-jhànas) if he is able
to by undertaking samatha-bhàvanà (tranquillity meditation).
Råpàvacara Cittas
(Consciousness mostly experienced in Råpa-loka)
There are 15 råpàvacara cittas which are divided into three classes
in the same way as the kàmàvacara-sobhaõa cittas are equally
divided into kusala, vipàka and kiriya cittas.
1 Råpàvacara kusala cittas – 5
råpa-jhàna (moral consciousness)
2 Råpàvacara vipàka cittas – 5
råpa-jhàna (resultant consciousness)
3 Råpàvacara kiriya cittas – 5
råpa-jhàna (functional consciousness)
A person, with ¤àõa-sampayutta rebirth consciousness and
who is not yet an arahat, may develop the five råpàvacara kusala
cittas one after another by undertaking the samatha-bhàvanà such
as meditating on kasiõa or on respiration.