Example sentences of "[prep] a 20 year " in BNC.

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1 Excitement swept back into the chess world in September this year with the return after a 20 year self imposed exile by the American former world champion Bobby Fischer .
2 This protectionism is based upon part of a 20 year old agreement called the Lomé Convention .
3 He came into the Guyana team as a 20 year runs straight away , and remained a permanent fixture .
4 Also presented with a 20 year long service award was vending engineer Tommy O'Donnell .
5 Any particular evaluator is free , therefore , to rate a treatment for an 80 year old as equally valuable as the equivalent treatment in a 20 year old , or as less valuable , or as more valuable .
6 Intraperitoneal ivalon mimicking peitoneal malignancy after plugged percutaneous liver biopsy is reported in a 20 year old woman with a history of nausea and abdominal disterision .
7 A sixth train is currently being constructed to produce the LNG required for a contract signed in October 1990 for the sale of 2,020 trillion BTUs over a 20 year period commencing in 1994 .
8 In conclusion , this study shows an absolute increase in the incidence of proximal gastric tumours in a defined population over a 20 year period .
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