FAN 48 Two Concealed Kongs (8 points)
Hand includes a combination of Two Concealed Kongs.
DOES NOT COMBINE WITH:
Two Concealed Pungs [66] (imp[lied)
FREQUENCY:
About 0.03% of all MCR games end with this 2 four-tiles combination scoring element.
source: Mahjong Greenbook MCR Rules 2014 (pdf)