
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
In $\triangle ABC$ and $\triangle DEF$, the following conditions are given: ① $AB=DE$; ② $BC=EF$; ③ $\angle B=\angle E$; ④ $\angle A=\angle D$. Among them, selecting any three conditions cannot guarantee that $\triangle ABC$ is congruent to $\triangle DEF$ is ______. (Simply fill in the number)

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