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Respuestas torcidas

      No x are m'.              |   |   |   |   |
                                |    ---|---    |
                                | 0     |     1 |
                                 ---------------
                                ---------------
                               | 0     |     0 |
                               |    ---|---    |
                               |   | 1 | 0 |   |
 17.  All x are m;       i.e.  |---|---|---|---|
      All m are y.             |   |   | 0 |   |
                               |    ---|---    |
[See remarks on No. 7, p. 60.] |       |       |
                                ---------------
                               ---------------
                              | 0     |       |
                              |    ---|---    |
                              |   |   |   |   |
 18.  No x' are m;      i.e.  |---|---|---|---|
      No m' are y.            |   | 0 | 0 |   |
                              |    ---|---    |
                              | 0     |       |
                               ---------------
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