
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
The points  $A$ ,  $B$ ,  $C$ ,  $D$ , and  $E$  lie in one plane and have the following properties:  $AB = 12, BC = 50, CD = 38,  AD = 100, BE = 30, CE = 40$ . 

Find the length of the segment  $ED$ . 

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