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Solve the all parts of following problem:
Problem: One of the harmonic frequencies of tube A with two open ends is 345 Hz. The next-highest harmonic frequency is 414 Hz.
Part A: What harmonic frequency is next highest after the harmonic frequency 414 Hz?
Part B: What is the number of this next-highest harmonic?
This is a physic problem, reply as soon as possible. Thank you.
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