The second example changes the take.
Dec misses a written question, then solves a similar problem using labeled parts. One observation suggests difficulty; another shows understanding under different conditions.
Lupa asks
What could explain the difference between the two attempts?
Try one response
You would be selecting evidence to protect a conclusion instead of investigating it.
Try another response
The comparison helps you test an explanation without diagnosing Dec.
Make something useful
Make a two-column comparison with one unknown at the bottom.
Tell a friend
One example does not erase the other. Let’s compare the conditions and ask what changed.
Say it your way. Keep the supported meaning and the part you still need to check.