Given what we know, we can say if we see that on the parietal bone there is a clear hole on the outside with evidence of beveling on the inner surface (the brain side), this wound must be the entry wound.
Gunshot wounds will always leave very specific marking on the victim. In the case of entry wounds, we will always observe beveling on the inner surface of the wound, which is the case in this situation, confirming that this is in fact an entry wound.
Therefore, we can confirm that given the evidence provided, the wound in question is an entry wound.
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