CREATE TABLE table_12099 ("Date" TEXT, "Epicenter" TEXT, "Magnitude" TEXT, "Intensity" TEXT, "Casualties" TEXT)

How many casualties were in the earthquake with an unknown intensity and an epicenter in the bou ra province?
SELECT "Casualties" FROM table_12099 WHERE "Intensity" = 'unknown' AND "Epicenter" = 'bouïra province'
SELECT "Casualties" FROM "table_12099" WHERE "Epicenter" = 'bouïra province' AND "Intensity" = 'unknown'