with following constraints?
                  
                  
                  .Each USN must be length of 10 characters
                  
                  
                  . 1st character must be digit and have either 1 or 2
                  
                  
                  . 2nd and 3rd characters must be upper case letters
                  
                  
                  . 4th and 5th characters must be digits and can have values between 0-9
                  
                  
                  . 6th and 7th characters must be upper case letters and can have combination any of the following: CS, IS, EC and ME
                  
                  
                  . 8th, 9th and 10th characters must be digits and can have values between 0-9
                  
                  
                
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