It is certain that Mary went to the kitchen. It is probably not the case that Jessica is a cat. It is highly unlikely that Greg is a frog. It is probably the case that if 'Greg is a frog' or 'Jessica is a cat' or both then John took the milk. We believe that if either 'Jessica is a cat' or 'Greg is a frog' but not both then Julius is gray. It is likely that if either 'Mary went to the kitchen' or 'Greg is a frog' but not both then Emily is a mouse.
We doubt that 'Jessica is a cat and Emily is a mouse'.
We doubt that 'Jessica is a cat and Emily is a mouse'.
It is probable that 'Jessica is a cat and Emily is a mouse'.

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

  %hop2
  conclusion:-and(factB,factZ).

  query(conclusion).
  
'Jessica is a cat and Emily is a mouse'.