Find the rule: 5.10.8.12.12.15.17.19

Find the rule: 5.10.8.12.12.15.17.19

The difference between the front and back terms of 5, 8, 12 and 17 forms an arithmetic sequence
The difference between the two terms before and after 10, 12, 15 and 19 also forms an arithmetic sequence
So it's easy to roll out the required numbers

24 circles are connected by one stroke. 5 in the first row, 5 in the second row, 5 in the third row, 4 in the fourth row, 5 in the fifth row
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I don't understand what you mean by that

First row 1.2.4.), second row 3.6.), third row (?). Fifth row (?)
It's a bottom-up arrangement
（）
（） （）
3 6 （）
1 2 4 （）

（27）
（9） （18）
3 6 （12）
1 2 4 （8）

1.5.8.4.10 in the first row, 4.3.4.6 in the second row, 1.1.2 in the third row, what is the number in the fourth row and what is the number in the fifth row?

Row 4: 0.1
Row 5: 1
Because: a row of 10-4 = 6 (the end of 2 rows)
Second row 6-4 = 2 (tail number of 3 rows)
So: the mantissa of four rows is 2-1 = 1
And because: a row of 5-1 = 4
2 rows 4-3 = 1
So: the first number in four rows is 1-1 = 0
The fifth row is 1-0 = 1