16.
Statements : Some dogs are cows. Some cows are cats.

Conclusions :
I. All dogs being cats is a possibility.
II. Some cats are dogs.

17.
Statements : No mat is fan. Some fans are cars. All cars are shirts.

Conclusions :
I. All mats are cars.
II. All shirts are cars.
III. Some shirts are fans.
IV. No shirt is a mat.

18.
Statements : Some clips are copies. Some copies are magazines. No magazines is a dictionary

Conclusions :
I. No copies are dictionary.
II. Some copies are dictionary.
III. Some copies are not dictionary.
IV. No clips are magazines.

19.
Statements : Some headphones are earphones. All earphones are telephones. No telephones are television.

Conclusions :
I. No earphones are television.
II. Some headphones are not television.
III. Some headphones are telephones.
IV. Some telephones are not television.

20.
Statements : All tourists are politicians. Some tourists are leaders. Some politicians are ministers.

Conclusions :
I. Some leaders are ministers.
II. All leaders are politicians.
III. Some ministers are not politicians.
IV. Some politicians are not tourists.