Rearrange the characters to complete Tang Dynasty poet Li Bai's poem ［送友人］ 'Seeing Off a Friend'. Drag and drop each character in the correct order into the dotted area below.

青山横北郭，白水绕东城。
此地一为别，孤蓬万里征。
? ? ? ? ?，落日故人情。
挥手自兹去，萧萧班马鸣。