Clear it in 3 steps
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Start the environment
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Investigate the target
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Submit the flag
A copy of the find command with the SUID bit set exists on this system. Use a well-known GTFOBins technique to obtain a root shell.
find / -perm -4000 2>/dev/null lists SUID binaries
Pay attention to a copy of find in an unusual path
Try the -exec-based technique from the GTFOBins page for find