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[Phenomenon] The rate is 450 times/second.
[Theory] The rate ... of 450 times/second **can be best explained ... —> The rate of 450 times/second can best be explained ...
・the rate of 450 times/second ---> the ring has ...
So I didn't do so well on this game because I played the children multiple times because it didn't say that they had to be played exactly once, so should we assume that they need to be played at least once unless stated otherwise? Thank you!!!