I want to know the answer to the following question:
What other text was related to the Ashtadhyayi?
All the background I'm provided with is that "In particular the Shiva Sutras, an auxiliary text to the Ashtadhyayi, introduces what can be considered a list of the phonemes of the Sanskrit language, with a notational system for them that is used throughout the main text, which deals with matters of morphology, syntax and semantics.". Is that enough to answer the question?
Answer: yes