This is a mixed columns and rows layout (three main columns, middle column split into two rows), with everything being static except the top row inside the middle column.

This is a mixed columns and rows layout (two main columns, later split into three rows), with everything being static except the center row in the right column.

This is a mixed columns and rows layout (three main columns, middle column split into two rows), with everything being static except the bottom row in the middle column.

This is a mixed columns and rows layout (three main columns, middle column split into three rows), with all of the surrounding columns and rows being static, except the very center container.