Rectangular, round, and oblong seals cannot be placed in the lower corner of the square seal. The square seal cannot be placed on the blank space at the top of the calligraphy and painting, otherwise it will take over the place.
Two seals, one square and one round, cannot match. Same-shaped prints can be matched. Two seals, one large and one small, cannot match. Same size available to match. Two seals, one rectangular and one oval, cannot match. Same-shaped prints can be matched.