CREATE TABLE table_73666 ("Circuit" CLOB, "Difficulty" CLOB, "Turns" FLOAT, "Direction" CLOB, "Setting" CLOB, "Conditions" CLOB, "Unlock Order" FLOAT, "Unlocks" CLOB, "Unlocked by" CLOB)

How many instances is the unlocked n/a?
SELECT COUNT("Setting") FROM table_73666 WHERE "Unlocked by" = 'N/A'
SELECT COUNT("Setting") FROM "table_73666" WHERE "Unlocked by" = 'N/A'