
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
Among the following events, the number of random events is     .①Throwing two dice twice in a row, and both times getting 2 points; ②On Earth, a pear falling from a tree will fall down if not caught; ③Someone winning the lottery; ④Having one daughter already, then having a boy the second time; ⑤Under standard atmospheric pressure, water heated to 90°C will boil.

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