1. accumulator
  2. barrel
  3. dam
  4. tank
  5. sun energy
  6. factory
  7. hydro
  8. plastic bag
  9. energy
  10. trash
  11. bio
  12. biology
  13. hydro power
  14. recycling bin
  15. plant
  16. world
  17. hydro power
  18. hydro power
  19. geothermal energy
  20. leaf
  21. energy
  22. biofuel
  23. bio energy
  24. ho
  25. ecology
  26. wind socket
  27. sprout
  28. lamp
  29. lamp
  30. energy
  31. hydro
  32. battery status
  33. plant
  34. windmill
  35. energy
  36. green energy
  37. gas station
  38. lamp
  39. magnet
  40. bio
  41. energy
  42. water
  43. socket
  44. earth
  45. earth
  46. recycle
  47. windmill
  48. leaf
  49. water
  50. save
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