What is the meaning of Distinguished_open_sets?

5-letter words containing

• 5-letter words containing d

• 5-letter words containing t

• 5-letter words containing l

• 5-letter words containing e

• 5-letter words containing a

5-letter words starting with

• 5-letter words starting with i

• 5-letter words starting with o

• 5-letter words starting with n

• 5-letter words starting with t

• 5-letter words starting with k

5-letter words in the middle

• 5-letter words in the middle d

• 5-letter words in the middle a

• 5-letter words in the middle o

• 5-letter words in the middle c

• 5-letter words in the middle t

5-letter words ending with

• 5-letter words ending with h

• 5-letter words ending with e

• 5-letter words ending with e

• 5-letter words ending with e

• 5-letter words ending with i

5-letter words excluding

• 5-letter words excluding e

• 5-letter words excluding z

• 5-letter words excluding r

• 5-letter words excluding f

• 5-letter words excluding d