$ph = [{1=>2,3=>4,5=>6,7=>8,9=>10,11=>12,13=>14,15=>16,17=>18,19=>20,21=>22,23=>24,25=>26,27=>28},
           'P','a','b','c','d','e','f','g','h','i','j','k','l','m',
           'n','o','p','q','r','s','t','u','v','w','x','y','z','J',' ' ];