long w(long,long);
long x(long,long);
long y(long,long);

RET(w(6,6)==0 && x(4,4)==1 && y(8,8)==0 && w(5,5) == 0 && x(3,3) == 1 && y(7,7) == 0 && w(0,0) == 1 && x(0,0) == 0 && y(0,0) == 1);