The whole page is divided into two parts (bucket square), vertical (banner) and three parts.
Feet 50×100 50× 50 25×100 33.3× 50
Big three feet 69×100 50× 69 34.5×100 33.3× 69
Four feet 69×138 69× 69 34.5×138 46× 69
Format: 69×69 (bucket square) or 34.5× 138 (banner)
Four-foot quadrant: 34.5×69