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:

1. All products are usefuls.

2. No useful is tough.

3. All toughs are durables.

Conclusions:

I. Some products are durables.

II. Some durables are usefuls.

III. All durables are toughs.