context: It is likely that Mary went to the garden. It is likely that Brian is a swan. There is a better than even chance that Bernhard is a rhino. There is little chance that if 'Brian is a swan and Bernhard is a rhino' then Julius is gray. Chances are slight that if 'Mary went to the garden' or 'Brian is a swan' or both then Sandra got the milk. It is probable that if 'Bernhard is a rhino' or 'Mary went to the garden' or both then Lily is yellow.
hypothesis: It is highly likely that 'Mary went to the garden' or 'Bernhard is a rhino' or both.
valid_hypothesis: It is highly likely that 'Mary went to the garden' or 'Bernhard is a rhino' or both.
invalid_hypothesis: There is little chance that 'Mary went to the garden' or 'Bernhard is a rhino' or both.
problog: 
    and(A,B) :- A,B.
    or(A,B) :- A;B.
    nand(A,B) :- not(and(A,B)).
    nor(A,B) :- not(or(A,B)).
    xor(A,B) :- or(A,B), nand(A,B).
  
    %hop0
    0.7::factA.
    0.7::factB.
    0.6::factC.
    %hop1
    0.1::factX:-and(factB,factC).
    0.1::factY:-or(factA,factB).
    0.7::factZ:-or(factC,factA).
  
    %hop2
    conclusion:-or(factA,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Mary went to the garden' or 'Bernhard is a rhino' or both.