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A simple Britsh Royal Family base of facts to study Prolog
female(elizabeth).
female(charlotte).
male(philip).
male(harry).
male(george).
male(louis).
male(charles).
male(william).
father(philip, charles).
father(charles, william).
father(charles, harry).
father(william, george).
father(william, charlotte).
father(william, louis).
mother(elizabeth, charles).
mother(diana, william).
mother(diana, harry).
mother(catherine, george).
mother(catherine, charlotte).
mother(catherine, louis).
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