CREATE TABLE table_10550 ("Name" CLOB, "Number" CLOB, "Builder" CLOB, "Date built" CLOB, "Wheel arrangement" CLOB, "Driving wheels" CLOB, "Cylinders" CLOB, "Boiler pressure" CLOB, "Notes" CLOB)

What is the wheel arrangement of the locomotive with number 6 or 4?
SELECT "Wheel arrangement" FROM table_10550 WHERE "Number" = '6 or 4'
SELECT "Wheel arrangement" FROM "table_10550" WHERE "Number" = '6 or 4'