Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements.

Statements:
Some cards are postcards.
Some cards are envelopes.
All envelopes are copies.

Conclusions:
I. Some copies are envelopes.
II. Some postcards are copies.
III. Some cards are copies.

Only conclusions I and III follow