
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
Determine which digits cannot be at the end (units place) of numbers of the form:
1) 1
2) 1
\[1+2=\ldots\]
\[1+3=\ldots\]
\[1+2+3=\ldots\]
\[1+3+5=\ldots\]
\[1+2+3+4=\ldots\]
\[1+3+5+7=\ldots\]

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