CREATE TABLE table_73566 ("Order number" TEXT, "Build date" TEXT, "Serial numbers" TEXT, "Country" TEXT, "Railroad" TEXT, "Numbers" TEXT, "Quantity" FLOAT)

The order number 713726-713735 has what serial number?
SELECT "Serial numbers" FROM table_73566 WHERE "Order number" = '713726-713735'
SELECT "Serial numbers" FROM "table_73566" WHERE "Order number" = '713726-713735'