改行のない非常に長い記事を想像してみてください。まるで
sentence 1. sentence 2. sentence 3. sentence 4. sentence 5. sentence 6. sentence 7.
sentence 8. sentence 9. sentence 10. sentence 11. sentence 12. sentence 13. sentence 14.
sentence 15. sentence 16. sentence 17. sentence 18. sentence 19. sentence 20. sentence
21. sentence 22. sentence 23. sentence 24. sentence 25.
5文ごとに改行したい。または、5 回ごとに "."
どうやってやるの ?