
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 set of integers \( T \) is called "orensano" if there exist integers \( a < b < c \) such that \( a \) and \( c \) are in \( T \) and \( b \) is not in \( T \). Find the number of subsets \( T \) of \(\{1,2, \ldots, 2019\}\) that are orensano.

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