CREATE TABLE table_9752 ("Class" TEXT, "Wheel arrangement" TEXT, "Fleet number ( s ) " TEXT, "Quantity made" TEXT, "Quantity preserved" TEXT)

What is Fleet Number(s), when Wheel Arrangement is '2-6-0', and when Class is 'Z'?
SELECT "Fleet number(s)" FROM table_9752 WHERE "Wheel arrangement" = '2-6-0' AND "Class" = 'z'
SELECT "Fleet number(s)" FROM "table_9752" WHERE "Class" = 'z' AND "Wheel arrangement" = '2-6-0'