Because it says mm
[ Ruler ] measure each length
【 Oil marker 】
9 cm = 90 mm
【 Candles 】
7 cm = 70 mm
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【 Notepad Box 】
13 cm = 130 mm
90 + 70 + 130 = 290
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Move to the first floor
Expand the panel next to the door
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90 + 70 + 130 = 290
Fit to
Make sure you're tied tight with a string.