The causes of homelessness, The problems homelessness causes, The best solutions for homelessness, The causes of a lack of affordable housing, The problems a lack of affordable housing causes, The best solutions for a lack of affordable housing, The causes of overpopulation, The problems overpopulation causes, The best solutions for overpopulation, The causes of war, The problems war causes, The best solutions for war, The causes of hacking, The problems hacking causes, The best solutions for hacking.

Problem-solution and cause-solution topics - each person give 1 problem/cause/solution

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