CREATE TABLE table_47554 ("Region  ( year ) " TEXT, "No. 1" TEXT, "No. 2" TEXT, "No. 3" TEXT, "No. 4" TEXT, "No. 5" TEXT, "No. 6" TEXT, "No. 7" TEXT, "No. 8" TEXT, "No. 9" TEXT, "No. 10" TEXT)

When Chloe was number 8, Olivia was number 2, Emma was number 1, and Ava was number 4, who was number 5?
SELECT "No. 5" FROM table_47554 WHERE "No. 8" = 'chloe' AND "No. 2" = 'olivia' AND "No. 1" = 'emma' AND "No. 4" = 'ava'
SELECT "No. 5" FROM "table_47554" WHERE "No. 1" = 'emma' AND "No. 2" = 'olivia' AND "No. 4" = 'ava' AND "No. 8" = 'chloe'