
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
An experiment involves extracting a part from a box containing items of three different grades. The events are defined as follows: $A$ - "a first-grade part is extracted," $B$ - "a second-grade part is extracted," $C$ - "a third-grade part is extracted." What do the following events represent: $A+B ; \overline{A+C} ; A C, A B+C$?

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