You can write them all in fine print on the left and keep your head down.
You can also sign on the left and right.
On the right is usually the donee,
On the left is the author and year.
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For banners,
The recipient can write in the upper left.
Write the author and date of the calligraphy work in the lower right corner.
(seal, many people are single, not double. One, three. The seal in the yin is combined with the seal in the yang, and there are also idle chapters. Some people never print, but draw a seal by themselves. )