* The code: "fls rsh nwh rng lsf rtt rdx"
* The goal: Replace missing vowels to reveal words.
Here's the solution:
* fls becomes "feels"
* rsh becomes "rush"
* nwh becomes "now"
* rng becomes "ring"
* lsf becomes "life"
* rtt becomes "rot" (this one is a bit tricky, but it fits the pattern)
* rdx becomes "rocks"
So the answer is: "Feels rush now ring life rot rocks"