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		 Utility
		 
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| Checker | A Checker is used to compare expected against obtained results for unit testing | 
| Error | An Error Exception is for an unrecoverable error | 
| Exception | An Exception thrown by classes in the idaeim namespace | 
| Invalid_Argument | An Error Exception for an invalid argument | 
| IO_Failure | An Error Exception for an I/O failure condtion | 
| Out_of_Range | An Error Exception for a value found to be out of its allowable range | 
 1.7.4