
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
Let sets A and B be two different subsets of a non-empty set M, satisfying: A is not a subset of B, and B is not a subset of A.  
(1) If M={a<sub>1</sub>, a<sub>2</sub>, a<sub>3</sub>, a<sub>4</sub>}, directly write down the total number of different ordered pairs (A, B);  
(2) If M={a<sub>1</sub>, a<sub>2</sub>, a<sub>3</sub>, …, a<sub>n</sub>}, find the total number of different ordered pairs (A, B).

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