The ratio of red to green is 7:6.

All four corner squares are the same colour.

The ratio of green to blue is 1:1.

The squares at the ends of the centre column are yellow.

The ratio of red to yellow is 7:6

The pattern has one line of symmetry.

The column on the left has two red squares.

The ratio of yellow to green is 1:1.

One of the diagonals is completely red

The squares at the ends of the centre row are yellow.

The top row is the same as the bottom row.

The left column is the same as the right column.

Every fourth square is blue (reading from left to right like reading a book).

The square in row 2 column 2 is yellow.

Neither diagonal has any blue or green squares.