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Births = deaths letters, 3 letters
Census find, perhaps: Abbr., 3 letters
Demographer's goal, perhaps: Abbr., 3 letters
Fam. planning advocates, 3 letters
Limit on births: abbr., 3 letters
No. of births = no. of deaths, 3 letters
Overcrowding antidote, initially, 3 letters
Result of a balance between the birth and death rates: Abbr., 3 letters