Question 2
The diagram shows a $6\times6$ chessboard with $4$ squares containing black circles and $4$ squares containing white circles. Use four different colours to divide the diagram into $4$ identical regions by going along the lines so that each region will be exactly of the same size and shape; and each region contains $1$ black circle and $1$ white circle. The regions may be rotated but not reflected. The circles do not have to be in the same relative positions within the region.
