
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
A grocer stacks oranges in a triangular pyramid-shaped stack. The base is a right triangle with dimensions 6 oranges by 9 oranges. Each subsequent layer above the base reduces such that the layer above a right triangle-shape also forms a smaller right triangle with each leg length reduced by one orange. The stack concludes with a single orange. How many oranges are in the stack?
A) 76
B) 78
C) 79
D) 80
E) 81

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