:- use_module(library(pfl)).
:- set_pfl_flag(solver,fove).
%:- set_pfl_flag(solver,fove).
t(ann).
t(dave).
% p(ann,t).
bayes p(X)::[t,f] ; [0.1, 0.3] ; [t(X)].
% use standard Prolog queries: provide evidence first.
?- p(dave,t), p(ann,X).
% ?- p(ann,X).