You have been assigned your own individual codes for the letters A, B, C and also a "parity property".
You can obtain your codes and parity property by following the FSA codes and party property link below.
You are the central hub for a communication system. Messages come to you as sequences of As, Bs and Cs but coded in binary.
Each such binary message is to be followed by a "check digit". This is a final 0 or 1 so that the entire binary message satisfies your parity property