It is probable that Jessica is a mouse. We believe that Greg is a frog. It is highly unlikely that Lily is a swan. It is probably the case that if 'Jessica is a mouse' or 'Lily is a swan' or both then Fred moved to the office. There is a better than even chance that if 'Lily is a swan' or 'Jessica is a mouse' or both then Bernhard is yellow. It is almost certain that if either 'Lily is a swan' or 'Jessica is a mouse' but not both then John put down the apple.
It is unlikely that 'Greg is a frog' or 'Bernhard is yellow' or both.
It is highly likely that 'Greg is a frog' or 'Bernhard is yellow' or both.
It is unlikely that 'Greg is a frog' or 'Bernhard is yellow' or both.

  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.
  0.75::factB.
  0.05::factC.
  %hop1
  0.7::factX:-or(factA,factC).
  0.6::factY:-or(factC,factA).
  0.95::factZ:-xor(factC,factA).

  %hop2
  conclusion:-or(factB,factY).

  query(conclusion).
  
'Greg is a frog' or 'Bernhard is yellow' or both.