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ก1–โ–ฺ ‰๑“šŒ‹‰สก
•sณ‰๐I
ณ@‰๐Fdetermine
Žž@ŠิF6538•b
ณ‰๐”F0–โ

‘ๆ2–โ–ฺ
“ส–สi‚ฦ‚ย‚฿‚๑j
parallel
concave
level
solid
convex


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