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										 |  |  | class KeyExistsError(Exception): | 
					
						
							|  |  |  |     pass | 
					
						
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										 |  |  | class UserExistsError(Exception): | 
					
						
							|  |  |  |     pass | 
					
						
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										 |  |  | class UserCredentialError(Exception): | 
					
						
							|  |  |  |     pass |