NO
Nontermination proof succeeded
Found this recurrent set for cutpoint 6: 0 <= x_0 and 0 <= x_post and 0 <= y_0 and 0 <= y_post and x_0-y_0 <= 0 and y_0-x_0 <= 0 and 0 <= x_0+y_0 and x_post-x_0 <= 0 and x_0-x_post <= 0 and 0 <= x_post+x_0 and x_post-y_0 <= 0 and y_0-x_post <= 0 and 0 <= x_post+y_0 and x_post-y_post <= 0 and y_post-x_post <= 0 and 0 <= x_post+y_post and y_post-x_0 <= 0 and x_0-y_post <= 0 and 0 <= y_post+x_0 and y_post-y_0 <= 0 and y_0-y_post <= 0 and 0 <= y_post+y_0 and 0 <= 0
Errors: