Three statements are given followed by three conclusions numbered I, II and III.

Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements.

Statements:
All books are pencils.
Some pencils are pens.
All pens are erasers.

Conclusions:
I. Some erasers are pencils.
II. All pens are books.
III. Some erasers are pens.

Only conclusions I and III follow.