1) Find three five-letter words with no repeating letters.
2) Then find three six-letter words with no repeats.
3) Next try four five-letter words with no repeats.
4) Finally, find four six-letter words with no repeats.
Examples (They don't have to make sense):
1) xylem brown acids
2) phylum string backed
3) xylem brown quick staph
4) ?
If you're looking for another challenge, post an original pangram (a sentence that uses all 26 letters of the alphabet like the quick brown fox one).