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apocalypse × 449science-based × 117
internal-consistency × 74
post-apocalypse × 50
zombies × 43
survival × 32
planets × 24
science-fiction × 24
earth × 24
society × 23
space × 23
weapon-mass-destruction × 23
biology × 21
physics × 20
near-future × 19
technology × 18
environment × 18
humans × 17
diseases × 16
magic × 15
warfare × 14
hard-science × 14
natural-disasters × 14
aliens × 13
government × 12