The ratio of green to red is 5:4.

The ratio of green to blue is 10:1.

The ratio of red to yellow is 4:3.

The pattern has two lines of symmetry.

The column on the left does not have any red squares.

The ratio of yellow to green is 3:5.

There is only one blue square.

The column on the right does not have any yellow squares.

The centre row does not contain any red squares.

The bottom row contains two red squares.