Keep an original while changing a copy

The command labels below distinguish an example from the activity.
On paper, track original.txt and copy.txt as separate saved files.
The word after > names the destination to replace; it is not text
that printf prints. Continue only in a new owned exercise directory.

Start in a new owned directory.
Worked: printf '%s\n' red > note.txt -> predicted red newline
Activity commands (one line at a time, only in a fresh files directory):
printf '%s\n' amber > original.txt
cp -i original.txt copy.txt
cat original.txt
cat copy.txt
printf '%s\n' violet > copy.txt
cat original.txt
cat copy.txt
Predicted final files: original.txt = amber; copy.txt = violet.
No command here deletes original.txt. Do not overwrite unrelated files.
Question initial note.txt: first
Question action: printf '%s\n' second > note.txt
What one word remains in that disposable file?