Three statements are given, followed by four conclusions numbered I, II, III, IV.
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: 
Some drums are violins.
Some violins are pianos.
All the pianos are flutes.
Conclusions:
I. Some flutes are violins.
II. Some pianos are drums.
III. No piano is drum.
IV. Some violins are drums.