In each of these questions a few Statements are followed by four conclusions numbered I, II, III and IV. Consider the given statements to be true even if they seem to be at variance with commonly known facts. Read all the conclusion(s) and then decide which of the given conclusion(s) logically follow(s) from the given statements.
Statements:
A. All stairs are lifts.
B. No lift is an escalator.
C. Some escalators are helicopters.
D. Some lifts are planes.
Conclusions:
I. No stairs is an escalator,
II. Some helicopters are not escalators.
III. Some stairs are planes.
IV. Some helicopters are escalators.
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