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I: Full length diagonal line supports in two directions; II: 2/3 length diagonal line supports in two directions;

III: 1/3 length diagonal line supports in two directions; IV: Central point support;

V: 1/3 length centrail cross line supports in two directions; VI: 2/3 length centrail cross line supports in two directions;

VII: Full length length centrail cross line supports in two directions.

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