1. Solution 1
   1. Pros
      1. Subtopic 1
      2. Subtopic 2
      3. Subtopic 3
      4. Subtopic 4
   2. Cons
      1. Subtopic 1
      2. Subtopic 2
      3. Subtopic 3
      4. Subtopic 4
2. Solution 2
   1. Pros
      1. Subtopic 1
      2. Subtopic 2
      3. Subtopic 3
      4. Subtopic 4
   2. Cons
      1. Subtopic 1
      2. Subtopic 2
      3. Subtopic 3
      4. Subtopic 4
3. Solution 3
   1. Pros
      1. Subtopic 1
      2. Subtopic 2
      3. Subtopic 3
      4. Subtopic 4
   2. Cons
      1. Subtopic 1
      2. Subtopic 2
      3. Subtopic 3
      4. Subtopic 4