Thank-you for the speedy reply. After searching on this message board earlier, I found out about "Digits" but it did not seem to work for me so I assumed I had misunderstood it. Initially I tried your suggestion without success. But reassured by your conviction I took a very careful look at things and discovered my fatal error. I had not capitalised 'Digits'. May this brief thread stand as a warning to those slack with their capitalisation! And thanks once again, it is much appreciated.

Thank-you for the speedy reply. After searching on this message board earlier, I found out about "Digits" but it did not seem to work for me so I assumed I had misunderstood it. Initially I tried your suggestion without success. But reassured by your conviction I took a very careful look at things and discovered my fatal error. I had not capitalised 'Digits'. May this brief thread stand as a warning to those slack with their capitalisation! And thanks once again, it is much appreciated.