This is a classic puzzle! The farmer can solve this problem by following these steps:

1. Take the chicken across the bridge first and leave it on the other side.
2. Go back and take the fox across the bridge next. Leave the fox on the other side with the chicken.
3. Take the chicken back across to the original side.
4. Take the grain across and leave it with the fox.
5. Finally, go back and take the chicken across again.

This way, all three items make it safely to the other side of the bridge without any problems!
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