set(auto).set(build_proof_object_2).clear(sigint_interact).assign(max_seconds, 10).initial_proof_object(junk).
((1 (INPUT) (OR (NOT (WOLF V1)) (ANIMAL V1)))
 (2 (INPUT) (OR (NOT (FOX V2)) (ANIMAL V2)))
 (3 (INPUT) (OR (NOT (BIRD V3)) (ANIMAL V3)))
 (4 (INPUT) (OR (NOT (SNAIL V4)) (ANIMAL V4)))
 (5 (INPUT) (OR (NOT (GRAIN V5)) (PLANT V5))) (6 (INPUT) (WOLF (SK1)))
 (7 (INPUT) (FOX (SK2))) (8 (INPUT) (BIRD (SK3)))
 (9 (INPUT) (SNAIL (SK4))) (10 (INPUT) (GRAIN (SK5)))
 (11 (INPUT)
  (OR (NOT (SNAIL V11)) (OR (NOT (BIRD V12)) (SMALLER V11 V12))))
 (12 (INPUT)
  (OR (NOT (BIRD V13)) (OR (NOT (FOX V14)) (SMALLER V13 V14))))
 (13 (INPUT)
  (OR (NOT (FOX V15)) (OR (NOT (WOLF V16)) (SMALLER V15 V16))))
 (14 (INPUT) (OR (NOT (SNAIL V17)) (PLANT (SK6 V17))))
 (15 (INPUT) (OR (NOT (SNAIL V17)) (EATS V17 (SK6 V17))))
 (16 (INPUT)
  (OR (NOT (WOLF V19)) (OR (NOT (FOX V20)) (NOT (EATS V19 V20)))))
 (17 (INPUT)
  (OR (NOT (WOLF V21)) (OR (NOT (GRAIN V22)) (NOT (EATS V21 V22)))))
 (18 (INPUT)
  (OR (NOT (BIRD V23)) (OR (NOT (SNAIL V24)) (NOT (EATS V23 V24)))))
 (19 (INPUT)
  (OR (NOT (ANIMAL V25))
      (OR (NOT (PLANT V26))
          (OR (EATS V25 V26)
              (OR (NOT (ANIMAL V27))
                  (OR (NOT (SMALLER V27 V25))
                      (OR (NOT (PLANT V28))
                          (OR (NOT (EATS V27 V28)) (EATS V25 V27)))))))))
 (20 (INPUT)
  (OR (NOT (ANIMAL V29))
      (OR (NOT (ANIMAL V30))
          (OR (NOT (EATS V29 V30)) (GRAIN (SK7 V29 V30))))))
 (21 (INPUT)
  (OR (NOT (ANIMAL V29))
      (OR (NOT (ANIMAL V30))
          (OR (NOT (EATS V29 V30)) (NOT (EATS V30 (SK7 V29 V30))))))))