
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 the triangle $ABC$, $DE$ is a straight line intersecting at point $C$. Given $\angle BAC = 50^\circ$ and $\angle BCE = 70^\circ$, if $\angle ECD = 40^\circ$, what is the measure of $\angle ACD$? Here is the diagram representation:
```
A
 \
  \
   C----E
  / \
 /   \
B     D
```

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