in case your kids don't like them, pretend that they are only for grown-ups anyway and protect your plate with your life. i would recommend trying it out if you never have before or even if you have. as a new customer, you can get a 100% welcome bonus as shown above. then there is only one wall of length 1, two of length 2, and three of length 3. here are 3 walls of length 7. the question is: how many different walls of length 6 are there (where walls of the same shape but different colors are considered to be the same here)? 