What is the meaning of Polynomial-time_reduction?

5-letter words containing

• 5-letter words containing a

• 5-letter words containing u

• 5-letter words containing o

• 5-letter words containing t

• 5-letter words containing x

5-letter words starting with

• 5-letter words starting with d

• 5-letter words starting with c

• 5-letter words starting with c

• 5-letter words starting with n

• 5-letter words starting with e

5-letter words in the middle

• 5-letter words in the middle t

• 5-letter words in the middle i

• 5-letter words in the middle l

• 5-letter words in the middle u

• 5-letter words in the middle d

5-letter words ending with

• 5-letter words ending with g

• 5-letter words ending with m

• 5-letter words ending with e

• 5-letter words ending with o

• 5-letter words ending with i

5-letter words excluding

• 5-letter words excluding u

• 5-letter words excluding s

• 5-letter words excluding o

• 5-letter words excluding h

• 5-letter words excluding i