
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 boy had a complete set of dominoes up to double 9, and he was trying to arrange the dominoes in a single line in the usual way (6 to 6, 3 to 3, blank to blank, etc.). However, his father told him:
- You are trying to do the impossible; but if you allow me to remove four dominoes, you will be able to achieve your goal, and the dominoes I take will have the smallest number of points possible under the circumstances.

Which dominoes did the father remove? Note that a standard set of dominoes ends at double 6, but we are considering a set extended up to double 9.

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