How would I solve Level 21 (endOfTheLine.js)?

How would I solve Level 21 (endOfTheLine.js)? - Elder sister and brother studying at home

I have checked and checked, but I can't edit the code, and am 100% sure that no code is editable.

I'm truly stumped right now.

Any help/suggestions?

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Dreamo Escape Level 21 Walkthrough




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Images: Andrea Piacquadio, Andrea Piacquadio, Katerina Holmes, emre keshavarz