In this game there will be a cake with a grid of spaces on it. Some Santa Claus and Christmas tree biscuits will be on some of the spaces. You need to decorate the cake by putting Santa Claus and Christmas tree biscuits on each of the remaining spaces. To prevent the cake from looking too boring, in each row and column the number of the two kinds of biscuits must be the same, and there must not be 3 or more consecutive biscuits of the same kind. You need to use logical skills to deduce which biscuit to put in the spaces to satisfy the rule. The faster you finish, the higher your rank.