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WordNet-Online 
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| Definitions from the Webopen bookDefinition:An open book is a metaphorical expression commonly used to describe a person or situation that is transparent, honest, and easy to understand. Examples:
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| open-plan open-skies open-source open open -end wrench open account open air open bidding open book open chain open circuit open country open door open door policy open ear open element device open end 
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