
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
From the digits set $\{1,2,3,4,5,6,7,8,9\}$, eight different digits are placed in an arrangement where five digits form a vertical column and four form a horizontal row, overlapping at one element. The sum of the entries in the vertical column is 25 and the sum of the entries in the horizontal row is 15. Determine the sum of the eight digits used.
A) 36 
B) 38 
C) 39 
D) 40

Present the answer in LaTex format: \boxed{Your answer}
user