Supati-panno Bhagavato sāvaka-saṅghoUjupaṭipanno Bhagavato sāvaka-saṅghoÑāyapaṭipanno Bhagavato sāvaka-saṅghoSāmīcipaṭipanno Bhagavato sāvaka-saṅghoYadidaṃ cattāri purisayugāni aṭṭha purisa-puggalāEsa Bhagavato sāvaka-saṅghoĀhuṇeyyo, Pāhuṇeyyo,Dakkhiṇeyyo, AñjalikaranīyoAnuttaraṃ puññakkhettaṃLokassā ti.
There seems to be an extensive article at the following which I’ll post here: http://www.buddhanet.net/cmdsg/getting5.htm
Cattāri Brahmavihārā 
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