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Find the rule 6.3.5.1.3.9 () ()
The last two should be (2) (7)
Every two numbers can be regarded as a number, so that 63, 51 and 39 can be obtained (of course, 6.3, 5.1 and 3.9 can also be regarded)
This is a sequence of arithmetic decreasing numbers, 63-51 = 12, 51-39 = 12, and the next two numbers are 39-12 = 27
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