Buddha Abhidhamma - Ultimate Science - BuddhaNet

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If a person, who is not yet an arahat, practices tranquillity
meditation, he may attain 5 råpàvacara kusala jhànas and 4 aråpàvacara
kusala jhànas, which are collectively called “9 mahaggata
kusala cittas”. If an arahat undertakes tranquillity meditation,
he may attain 5 råpàvacara kiriya jhànas and 4 aråpàvacara kiriya
jhànas which are collectively called “9 mahaggata kiriya cittas.”
If a person, endowed with three roots—namely, alobha, adosa
and amoha—undertakes insight-meditation properly and strenuously,
he may attain the four maggas and the four phalas (the four
paths and their fruitions) which are known as the 8 lokuttara cittas.
Five Råpàvacara Appanà Vãthis
(Manda-pa¤¤à) Na–Da– “Ma–Pa–U–Nu–Go–Jha” –Bha–Bha–
(Tikkha-pa¤¤à) Na–Da– “Ma–U–Nu–Go–Jha” –Bha–Bha
1 When the pañibhàga-nimitta of kasiõa appears at the minddoor,
the life-continuum vibrates twice and becomes
arrested (Na-Da). Then mano-dvàràvajjana (Ma) adverts
the consciousness-stream towards the pañibhàga-nimitta,
observes and decides the sense-object whether it is good
or bad.
Then one of the two somanassa-sahagataü ¤àõasampayuttaü
mahà-kusala cittas performs the upacàrasamàdhi
javana-function four times in the persons of slow
or dull wisdom (manda-pa¤¤à) under the names of
Pa: parikamma: preparation of jhàna,
U: upacàra: proximity of jhàna,
Nu: anuloma: adaptation or connection between
parikamma and jhàna; it acts as a
bridge harmonising the lower cittas
with the higher cittas.