
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 function $f(x) = \frac{2 + x}{2 - 2x}$, define $f_1(x) = f(f(x))$, $f_2(x) = f(f_1(x))$, and in general $f_n(x) = f(f_{n-1}(x))$. Calculate $f_{1994}(4)$.

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