I misread the condition, sorry. Is the following input right?
The input data do not satisfy the conditions in the following sentence:
That is, an uppercase letter, a single space, an arrow, a single space, and a string of zero or more uppercase or lowercase letters. Rule productions are at most 10 characters long. The start variable S is the head of the first rule given.
Looking at the data provided in this post, line 11 of that input file is invalid. Other lines may also be invalid.
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