The key matrix is a concept used in cryptography, particularly in the field of encryption and decryption. It's not related to the content provided, which is about product-market fit in business.
However, to find a key matrix for a simple Hill cipher (a type of substitution cipher), you need to follow these steps:
1. Choose a keyword, where length is a perfect square (like 4, 9, 16, etc.).
2. Convert each letter of the keyword to its equivalent numerical value (A=0, B=1, ..., Z=25).
3. Arrange these numerical values into a square matrix. This is your key matrix.
Remember, the key matrix should be invertible and its determinant should not be zero. Also, the determinant and the matrix size should be coprime to 26 (the number of letters in the alphabet).
Please consult a cryptography textbook or resource for more detailed instructions and examples.
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