When you say "order", you mean couplets, right? Nave's words are out of order. The simplest way to distinguish couplets from upper and lower couplets: look at the last word, its tone is one or two (basically corresponding to ancient sounds), then it is lower couplet, and its tone is three or four (basically corresponding to ancient sounds), then it is upper couplet. You face the work, hang couplets on your right hand and bottom couplets on your left hand.