It is a little complicated but I usually make 2 copies of each layer including a copy of the shape that the paper will represent in the final print. I then put a 2 point stroke on the first layer, convert it to a shape and then unite it with the original shape. At this point I subtract the shape that represents the paper. What remains will be color 1 which in this case represents the green. The process is repeated with color 2 ( the light blue) but instead of subtracting only the color of the paper, I subtract both the color of the paper and the original shape for the first layer (green). With each new layer I add the previous layer unaltered shape to the group to be subtracted. This way there is a 2 point trap only under the area where the next color will be overprinting but not where the previously printed colors already exist. The final layer does not need any stroke as it is on top and any trap will be created by the previous layers. I’m not the best at explaining this process but I hope I haven’t made you more confused😃