It can't be solved:
1)If he takes corn at the other side first, Leviathan eats, fox or chicken
2)If he takes chicken first then
a)if he tries to pass the corn, Leviathan eats the fox
b)if he passes the fox it would eat the chicken at the other side
c)if he passes Leviathan it would eat the chicken
3)if he takes the fox first then
a)if he passes the corn Leviathan eats the chicken
b)if he passes the chicken the fox would eat it
c)if he passes Levi, it would eat the fox
4) finally if Levi goes first then
b)fox cannot be second becuse they would be eaten by Levi and
c) corn cannot be second because fox and chicken would be left alone together
Tie Leviathan to the boat and tow him on each leg of the trip. Then proceed as you would have to transport the other three.
first he takes the chicken across and leaves it, the fox will not eat the corn and the leviathan will not eat the fox with the corn there. he leaves the chicken on the other side and returns. on the second trip he takes the fox across and brings back the chicken. the third trip he takes half of the corn. the forth trip he takes the leviathan. the fifth trip he takes the other half of the corn. the sixth trip he takes the chicken again. it will take six trips but everything arrives safely. the leviathan is never left alone with the fox or the chicken without corn, the chicken is never left a lone with the corn, and the fox and chicken are never left alone.
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