There are multiple nulls in place of n, d and such. For example, in PDF:
A rational number is a number that can be expressed as a ratio n/d , where n and d are integers, except that d cannot be zero.
In EPUB:
A rational number is a number that can be expressed as a ratio n/d, where null and null are integers, except that null cannot be zero. null is called the numerator and null the denominator.
Please fix this. Just use search for nulls. There are so many like this and in very important places.
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