The UK's worst crash remains the collision between a passenger train and a wooden prop in Gretna Green in Scotland in May 1915, which claimed 227 lives.

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Garry Green is a 28-year-old Australian prop forward who spent last season with Batley Bulldogs.

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Another common test, which can be purchased online, is to give people a particularly bitter chemical such as PROP or PTC, which are similar to a compound found in many dark-green vegetables.

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