There is little chance that Emily is a mouse. Chances are slight that Daniel left the milk. There is little chance that Greg is a rhino. It is unlikely that if either 'Emily is a mouse' or 'Greg is a rhino' but not both then Jessica is a cat. There is little chance that if 'Greg is a rhino' or 'Emily is a mouse' or both then Brian is a swan. It is probably not the case that if 'Daniel left the milk' or 'Emily is a mouse' or both then John went to the office.
It is highly likely that 'Jessica is a cat and Brian is a swan'.
It is impossible that 'Jessica is a cat and Brian is a swan'.
It is highly likely that 'Jessica is a cat and Brian is a swan'.

  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
  0.1::factA.
  0.1::factB.
  0.1::factC.
  %hop1
  0.2::factX:-xor(factA,factC).
  0.1::factY:-or(factC,factA).
  0.25::factZ:-or(factB,factA).

  %hop2
  conclusion:-and(factX,factY).

  query(conclusion).
  
'Jessica is a cat and Brian is a swan'.