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1、They found （10，000） colorful glass treasures and glassmaking tools.
2、There was primary glass production in sub-Saharan Africa at least from （the 11th to 15th centuries）.
3、They （traded them） far and wide.
4、They used crucibles to （melt and refashion） some of them into new beads.
5、It refers to （the art of glass making）.
1、They found （10，000） colorful glass treasures and glassmaking tools.
2、There was primary glass production in sub-Saharan Africa at least from （the 11th to 15th centuries）.
3、They （traded them） far and wide.
4、They used crucibles to （melt and refashion） some of them into new beads.
5、It refers to （the art of glass making）.
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