CREATE TABLE table_204_717 (id NUMBER, "season" CLOB, "level" NUMBER, "division" CLOB, "place" CLOB)

the two level 6 seasons were 2012/13 and what other season ?
SELECT "season" FROM table_204_717 WHERE "season" <> '2012/13' AND "level" = 6
SELECT "season" FROM "table_204_717" WHERE "level" = 6 AND "season" <> '2012/13'