YES


Termination: (Ranking Functions Found)
------------
l0: < < x_0 + y_0 > >
l1: < < -1 + x_0 + y_0 >, < -1 + x_0 + y_0 >, < -c_0 > >
l3: < < x_0 + y_0 >, < x_0 + y_0 >, < 0 > >
l4: < < x_0 + y_0 >, < x_0 + y_0 >, < -c_0 > >
l5: < < -1 + x_0 + y_0 >, < -1 + x_0 + y_0 >, < -c_0 > >


method 1