Determine the frequency of occurrence of each of the letters in this sentence. ?

Determine the frequency of occurrence of each of the letters in this sentence. From these results, determine a fixed-length binary code and a variable-length binary code for the letters. Explain your procedure. Recall that variable-length codes must be designed for unique decodability. Theere are many appropiate codes which you may create.|||Turn it into ASCII. Add the binary and make a CRC16 out of it.