Make a 4-by-4 logic grid on your own paper. Use it to help solve the logic
puzzle and answer the question.
A barbershop, a coffee shop, a flower shop, and a nail salon each
have a sign of a different color: blue, green, red, or purple (but not
necessarily in that order).
The coffee shop and the barbershop are next to the shop with the
green sign.
The nail salon is not next to any of the other shops.
The barbershop's sign is either blue or red.
The store with the purple sign is next to the store with the green
sign.
Which shop has the purple sign?