Number of unit cells sharing a corner or face particle

The same question, asked 2 times: 25 Apr 2025 S2*, 18 Apr 2026 S2. Every wording below, oldest first.

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Question 1
25 Apr 2025 S2
95 $What is the total number of unit cells shared by each corner particle of bcc unit cell?$
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Question 2
18 Apr 2026 S2
20 $What is the total number of adjacent unit cells shared by each face particle of fcc unit cell ?$
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