There should be a stripy pattern of yellow and aqua below (each vertical stripe should be straight and unbroken).

x  xx  xxx  xxxx
x  xx  xxx  xxxx
x  xx  xxx  xxxx
x xx xxx xxxx
x xx xxx xxxx
x xx xxx xxxx
x xx xxx xxxx
x xx xxx xxxx
x xx xxx xxxx
x xx xxx xxxx
x xx xxx xxxx