ABSTRACT
We can combine strokes and/or letters with shading, in the same diagram. This one contains the two statements 'No dogs are cats' and 'Paddy is one or the other, but not both': https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780203061350/f5ce7580-7c0c-4392-aeab-0c1bd683fe20/content/fig332_B.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/>
