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 pencils are erasers.

All pens are erasers.

All erasers are scales.

Conclusions:

I. All pens are scales.

II. All erasers are pencils.

III. Some erasers are pens.