NO Nontermination proof succeeded Found this recurrent set for cutpoint 6: x_0-x_post <= 0 and x_post-x_0 <= 0 and x_0-z_0 <= 0 and z_0-x_0 <= 0 and x_post-z_0 <= 0 and z_0-x_post <= 0 and y_post-y_0 <= 0 and y_0-y_post <= 0 and -x_0+1 <= 0 Errors: