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                    2006
                
            
            
                11 Jul
                
                '06
                
            
            
            
        
    
                10:25 a.m.
            
        Mauricio, The let variant is an expression, while the where one is not. An expression is allowed to happen inside a greater expression, you just need to place the parentheres properly as you did. The where keyword does not construct a valid expression, it can only happen inside some other constructs (like module and function declarations). Cheers, Thiago Arrais