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To hold the tubes open.
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Related questions
What is the collective noun for arches?
Some arches/a few arches
How many arches did the colosseum have?
340 Arches in total
Where did arches originate?
arches originated in rome
How many arches are in the colosseum?
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What types of rocks are in Arches National Park?
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Did the Romans popularize wells arches columns or temples?
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