It's also interesting that PARADICE appears in this message twice. One time is spelled backwards (ECIDARAP). Probably he did this because how his first cipher w

It's also interesting that PARADICE appears in this message twice. One time is spelled backwards (ECIDARAP). Probably he did this because how his first cipher was cracked withing hours/days. It was cracked by the wife of this high-school teacher. She thought the cipher would start with the word "I" and it would also contain words like "KILL". She found these words within the message so with the help of his husband, they guessed the key and the whole message. I think Zodiac learned from his mistakes and decide to make it more complicated spelling it backwards, so the same symbols won't appear twice. He probably thought code-breakers would also be looking for important words he included on his earlier messages, such as "paradice" or "slave/s". Having a long sequence of symbols that appears twice and transposing them to his most known words could have led to break the code really fast.