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quantity dimensional formula
period p L^0 M^0 T^1
length of string \ell L^1 M^0 T^0
| quantity  |  dimensional formula  |
|---:|:---|
|  period $p$  |  $L^0 M^0 T^1$  |
|  length of string $\ell$  |  $L^1 M^0 T^0$  |
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