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A series of five short lines. The first has an up and a down arrow, and is labeled below 1 s. The second has an up and a down arrow, and is labeled 2 s. The third has an up arrow and no label. The fourth has an up arrow and is labeled 2 p. The fifth has an up arrow and no label. Which element is this?

User Ryan K
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234hope it was helpful
User Tyler B
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