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Phrase:    21. population density Phonics:   Audio:	Phrase:    22. relief Phonics:   Audio:
Phrase:    23. overcrowding Phonics:   Audio:	Phrase:    24. birth rate Phonics:   Audio:
Phrase:    25. solar energy Phonics:   Audio:	Phrase:    26. sustainable development Phonics:   Audio:
Phrase:    27. sustainable city Phonics:   Audio:	Phrase:    28. greenhouse gas Phonics:   Audio:

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