The search for equations is the search for concordances, finding "what goes with what" and "what follows what" in a certain vocabulary. The words can be connected in many ways: through a conjunction, metaphorically, or even just coincidentally. One single concordance doesn't necessarily mean a whole lot, but a consistent pattern does. In the two passages, see what equations you can find that go together with the two concepts of "lawful" and "trade." Click on the link below to find my sample.