
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
Given the universal set $I = \{1, 2, 3, 4, 5, 6, 7, 8\}$, where $A = \{1, 2, 3, 4\}$, and $B = \{3, 5, 6, 7\}$  
(1) Find $A \cup B$  
(2) Find $A \cap (C_I B)$

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