1. plant
  2. ho
  3. light bulb
  4. eco factory
  5. lamp
  6. lamp
  7. energy
  8. science
  9. plant
  10. tank
  11. atom
  12. solar
  13. electric tower
  14. hydro power
  15. plastic bag
  16. water
  17. rain
  18. wind socket
  19. solar panel
  20. socket
  21. energy
  22. windmill
  23. save
  24. battery
  25. lamp
  26. magnet
  27. factory
  28. wind
  29. barrel
  30. dam
  31. factory
  32. windmill
  33. hydro
  34. magnet
  35. socket
  36. thunder
  37. hydro
  38. energy
  39. world
  40. house
  41. energy
  42. world
  43. sun
  44. energy
  45. recycle
  46. energy
  47. plug
  48. rain
  49. corn
  50. factory
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