Unlike the word 'tiger', the word 'brother' not … what it means; thus: 'In one sense, the … a set of necessary and sufficient conditions. Technically … The difference between [the conditions for a tiger] a and [the conditions for a brother] b is this: my tiger need not satisfy every condition … if he did not satisfy every condition of … be a freakish tiger and something else that … a brotherlike freak? A brother who, say, ate … notice that 'He has an old tiger.' is …
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