Answer
The noun in-and-in is uncountable.
The plural form of in-and-in is also in-and-in.
Examples
| Unceasingly did the drama practice the in-and-in breeding of sexual problems. |
| The red deer of the North Island represent the greatest case of in-and-in breeding of wild animals on record. |
| Breeds of animals deteriorate rapidly through lack of nourishment and from in-and-in breeding. |
| The more well-bred the animals, the greater are the injurious effects of in-and-in breeding. |
| Many, perhaps, will see an additional cause in teleological considerations, aiming at the avoidance of in-and-in breeding. |
| In fact, this in-and-in breeding seems one of the curses of village life, and a cause of stagnation and narrowness of mind. |
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