You should have been able to decipher the message by frequency analysis: noting which letters are the most common.

Give yourself six points if you correctly decipher the message.

The design had the cipher alphabet and number disks coupled by friction, and there was often slippage when trying to decipher a message.

Only those at home with a decoder wheel could decipher the message.

Upon receiving the denial message the provider must decipher the message, reconcile it with the original claim, make required corrections and resubmit the claim.