Example sentences of "of [noun sg] [prep] a period " in BNC.
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| 31 | A valuable feature of our case is that it provides a detailed profile of the natural history of EATCL over a period of 12 months from initial presentation to the introduction of chemotherapy . |
| 32 | Because nothing can travel faster than light , an object that can vary its output of energy within a period of a few days can be at best a few light-days across . |