Cycle through the following operations one at a time until no further operations can be performed:

1. If the string contains 'abc', replace the first occurrence with 'cab'.
2. If the string contains an even number of 'b's (and at least one 'b'), append 'ab' at the end.
3. If the string length is greater than 15, remove the middle character.
4. If the string contains 'bca', delete the first occurrence entirely.
5. If the string prefix is 'cb', replace it with 'aa' and delete the last character.
6. If the string suffix is 'cc', replace it with 'b' and prepend 'a' to the start.

For the string "ccacbbcacaba", what is the final string after performing all operations?

Provide your answer as a string in the following format:

<<< "some_final_string" >>>
