irth(alexander1926, maria1925, igor1954, male, 1954).
birth(igor1954, vera1953, alexander1982, male, 1982).
birth(alexander1982, liliana, diana2014, female, 2014).
birth(alexander1982, liliana, kristina2012, female, 2012).
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marriage(igor1954, vera1953, 1978).
marriage(alexander1926, maria1925, 1946).
death(alexander1926,1970).
death(maria1925, 2004).
divorce(a,b,1999).
father(X,Y) :- birth(X,_,Y,_,_).
mother(X,Y) :- birth(_,X,Y,_,_).
male(X) :- birth(_,_,X,male,_).
female(X) :- birth(_,_
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