For some problems there is no solution.
mixed-f34-p17-u20-v5-g5-a60-n10-a20-b80-n50-f5-r1
 Reachable states exhausted after 45 steps.

mixed-f32-p16-u20-v5-g5-a60-n10-a20-b80-n50-f5-r4
 Reachable states exhausted after 43 steps.

mixed-f20-p10-u20-v5-g5-a60-n10-a20-b80-n50-f5-r2
 Reachable states exhausted after 25 steps.