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KEY: Subsist.
SYN: be, live, feed, continue, exist.
ANT: Fail, starve, decay, die.
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KEY: Substance.
SYN: Matter, material, body, pith, gist, import, essential, meaning, Be.
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KEY: Substantial.
SYN: Existing, real, solid, true, corporeal, material, strong, stout, massive, bulky, tangible.