black square on white ground white square on black ground black cross on white ground two black squares on white ground
squares black and white two squares and crosses
black square on black ground black square on black ground black cross on black ground two black squares on black ground
black squares on black ground black squares and black crosses on black ground
yellow square on red ground red square on blue ground blue cross yellow cross
coloured squares on coloured ground coloured crosses on coloured ground
red squares on yellow ground yellow square on blue ground yellow cross red cross
coloured squares on coloured ground coloured crosses on coloured ground
two red squares on yellow ground two blue squares on red ground yellow-red-blue squares red-yellow-blue squares
two coloured squares on coloured ground red-blue-yellow squares