Replace copy/pasted code with for loop
Replace copy/pasted code with for loop

Also remove duplicates in the test: (honda, toyota) == (toyota, honda)
for our purposes. And add duplicates, we want it to work if we have
multiple of the same car.

dave-lab41/pelops,Lab41/pelops,dave-lab41/pelops,d-grossman/pelops,Lab41/pelops,d-grossman/pelops