CREATE TABLE table_26807 ("Episode no." FLOAT, "Airdate" TEXT, "Viewers" TEXT, "BBC Three weekly ranking" TEXT, "Cable rank" TEXT)

List the number of bbc rankings with cable rankings of 6.
SELECT "BBC Three weekly ranking" FROM table_26807 WHERE "Cable rank" = '6'
SELECT "BBC Three weekly ranking" FROM "table_26807" WHERE "Cable rank" = '6'