Keep Q2_K/Q3_K_M gguf only

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NaturalSQL-6.7B-v0-Q4_0.gguf

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NaturalSQL-6.7B-v0-Q5_0.gguf

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NaturalSQL-6.7B-v0-Q5_K_M.gguf

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NaturalSQL-6.7B-v0-Q6_K.gguf

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NaturalSQL-6.7B-v0-Q8_0.gguf

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