CREATE TABLE table_16510 ("Hand" TEXT, "1 credit" FLOAT, "2 credits" FLOAT, "3 credits" FLOAT, "4 credits" FLOAT, "5 credits" TEXT)

How many 4 credits is the hand two pair?
SELECT COUNT("4 credits") FROM table_16510 WHERE "Hand" = 'Two pair'
SELECT COUNT("4 credits") FROM "table_16510" WHERE "Hand" = 'Two pair'