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In each question given below, there are three statements followed by four conclusions numbered I, II, III and IV. You have to take the given statements to be true even if they seem to be at variance with commonly known facts and then decide which of the conclusion(s) logically follows from the given statements.

Statements:
a. All tigers are lions.
b. All lions are horses.
c. No horses are monkeys.
Conclusions:
I. All tigers are horses.
II. No tigers are monkeys.
III. Some lions are tigers.
IV. Some monkeys are not tigers