The image indicates that there is one possible position missing.
1105 (image/jpeg), 43.87 KB, created by yutongmen2-c on 2021-11-10 23:47:10 HKT
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Creator: yutongmen2-c
Created: 2021-11-10 23:47:10 HKT
Size: 43.87 KB

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Attachments on bug 552: 73