(2) Couplets are poems that seem to be parallel in structure, and they are linked one by one. Take the "Nine Machines" as an example. It says "one machine", "two machines" and then "three machines" ... so there is a logic, and each poem has a line connected.
(3) reelection is actually a bit like a thimble, or a special thimble-a ring, for example: "Keep the Tao wholeheartedly, the Tao is endless, there is joy in poverty, and there is joy in poverty." Taotao, poor-poor, happy-happy
(4) Implicit inclusion is to cut and rewrite other poems into words. However, in fact, "concealment" is a tool to correct crooked wood. For example, you can see this webpage. /view/ 133857.htm
Sorry to explain.