A Form of life (n.) is 'the system of reference by means of which we interpret an unknown language.
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A Form of life (n.) is a form created by and for those who are in possession of language.
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A Form of life (n.) is never a matter of shared opinions. Rather it involves the entanglements of customs, habits, rules and examples.
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A Form of life (n.) is not agreement in definitions or opinions, but rather, agreement in judgments.
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A Form of life (n.) is what has to be accepted, the given.