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Iron and a few other materials including cobalt and nickel have a strong magnetic force. |
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Only iron and a few other materials such as cobalt and nickel show strong magnetic effects. |
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It is only iron and a few other materials like cobalt and nickel that exert a strong magnetic force. |
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The magnetic force of iron and a few other metals such as cobalt and nickel are the only strong ones. |
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The only metals, other than iron, to show a strong magnetic force are cobalt and nickel. |