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Sure, here's an example of unique content optimized for the keyword 'frisk x chara' using synonyms:
1. The main character x Chara
2. Frisk with the lost soul
3. The adventurer and Chara
4. Frisk with Chara
5. The challenger and the wanderer
Remember, you can create an infinite number of combinations using different synonyms and variations, but make sure to maintain readability and coherence.