trajectory.role: user
trajectory.content: You are reviewing a completed episode.
  
  Reasoning log:
  - The assistant used substitution.
  - The assistant used lemma.
  - Outcome: the answer was correct.
  - Reward: +1.
  
  History of earlier episodes:
  - When the assistant used substitution, the answer was correct in 8 of 10 episodes; when it did not, the answer was correct in 1 of 10.
  - When the assistant used lemma, the answer was correct in 6 of 10 episodes; when it did not, the answer was correct in 6 of 10.
  
  Review.
  Step 1: the assistant used
trajectory.role: assistant
trajectory.content:  substitution