46.
Statements : Some keys are staplers. Some staplers are stickers. All the stickers are pens.

Conclusions :
I. Some pens are staplers.
II. Some stickers are keys.
III. No sticker is key.
IV. Some staplers are keys.

47.
Statements : Some questions are answers. Some answers are writers. All the writers are poets.

Conclusions :
I. Some writers are answers.
II. Some poets are questions.
III. All the questions are poets.
IV. Some poets are answers.

48.
Statements : Some envelops are gums. Some gums are seals. Some seals are adhesives.

Conclusions :
I. Some envelopes are seals.
II. Some gums are adhesives.
III. Some adhesives are seals.
IV. Some adhesives are gums.

49.
Statements : All the papers are books. All the bags are books. Some purses are bags.

Conclusions :
I. Some papers are bags.
II. Some books are papers.
III. Some books are purses.

50.
Statements : Some rats are cats. Some cats are dogs. No dog is cow.

Conclusions :
I. No cow is cat.
II. No dog is rat.
III. Some cats are rats.