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The Game of Logic by Lewis Carroll
page 20 of 121 (16%)
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Symbols. | Meanings.
_______________|_________________________________
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| | |
| | | Some y are x';
| | | i.e. Some nice are not-new.
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| | |
| 1 | |
| | |
----- |
|
----- |
| | | No y are x;
| 0 | | i.e. No nice are new.
| | |
----- | [Observe that this is merely another way of
| | | expressing "No new are nice."]
| | |
| | |
----- |
|
----- |
| | |
| | | No y are x';
| | | i.e. No nice are not-new.
----- |
| | |
| 0 | |
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