to know the rights of a case
                        
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                        to feel perfectly at home on a subject
                        
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                        to know something perfectly
                        
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                        to have something at one's finger ends
                        
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                        to have a perfect knowledge of sth
                        
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                        to know something backwards
                        
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                        to know something inside out
                        
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                        to keep one's end up
                        
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