Rank the following items in order of relevance to the topic of artificial intelligence.
Robotics, Machine Learning, Natural Language Processing
1. Machine Learning
2. Natural Language Processing
3. Robotics
Complete the following task based on the instruction and optional input provided.### Instruction:
Rank the following items in order of relevance to the topic of artificial intelligence.

### Input:
Robotics, Machine Learning, Natural Language Processing

### Output:
1. Machine Learning
2. Natural Language Processing
3. Robotics