The prompt specifies the total number of letters (8+9) but combines adding and subtracting. Here are two interpretations considering addition and subtraction of 8 and 9:
Total Letters: 17 (8+9)
- Paradigma itself is 8 letters and fulfills this criteria.
- Paradigmatisch (17 letters) - the adjective form of "paradigm."
Total Letters: 1 (8-9)
- There is no meaningful word with 1 letter derived from "paradigm" through subtraction.
Since "paradigm" itself fulfills the criteria for the first interpretation (total letters: 17), it's the most likely answer.