[["Bronze is an alloy consisting primarily of copper, commonly with about 12\u201312.5% tin and often with the addition of other metals. Some bronze alloys are stronger then steel.", 28.666666666666664], ["Bronze is an alloy consisting primarily of copper, commonly with about 12\u201312.5% tin and often with the addition of other metals (such as aluminium, manganese, nickel or zinc) and sometimes non-metals or metalloids such as arsenic, phosphorus or silicon.", 27.0]]
what two elements make up bronze
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