Q: Would it be impossible to use an Iwato scale for a twelve-tone technique composition? Now, let's think step by step:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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The Iwato scale has 5 pitch cases. The chromatic scale has 12 pitch cases.
The answer: yes.