Here is the step-by-step instruction if treated as a riddle:
1. The farmer takes the chicken across first, then he goes back and takes the grain.
2. He leaves the grain on the other side, and then takes the chicken back with him.
3. He then leaves the chicken and takes the fox to wait with the grain on the other side.
4. Finally, he goes back and gets the chicken. All of them are now across.

The key to solving this riddle is realizing that taking things back from across the bridge is never forbidden.
Reaching the solution should be easy afterwards, as this riddle tests creative thinking more than task scheduling.
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