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SQL
query:- read(A), read(B), read(C), q1(B,A), q2(A,B,C). q1(X,Y):- write('select '), write(X), write(', count()/(select count() from '), write(Y), write(') as probabilidad from '), write(Y), write(' where '), write(X), write(' in(select distinct '), write(X), write(' from '), write(Y), write(') group by '), write(X), write(';\n'). q2(X, Y, Z):- write('select '), write(Y), write(', '), write(Z), write(', count()/(select count() from '), write(X), write(') as Probabilidad from '), write(X), write(' where '), write(Y), write(' in(select distinct '), write(Y), write(' from '), write(X), write(') and '), write(Z), write(' in(select distinct '), write(Z), write(' from '), write(X), write(') group by '), write(Y), write(', '), write(Y), write(' order by '), write(Y), write(', '), write(Z), write(';\n'). :- query.
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