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Coffee and tea are

Coffee originated in

Coffee and Tea are

Coffee and quinine are obtained from plants of

Coffee : Coffeine : : Tobacco : ?

In a group of 36 persons ,20 take coffee but not tea. 16 take tea coffee .Find the number of persons who take niether tea nor coffee.

In a group of 52 persons, 16 drink tea but not coffee and 33 drink tea. Then, the number of persons who drink coffee but not tea, is