There is little chance that Bernhard is yellow. We believe that Jessica is a mouse. It is likely that Mary went to the kitchen. There is a very good chance that if 'Jessica is a mouse' or 'Bernhard is yellow' or both then Brian is green. It is unlikely that if 'Bernhard is yellow and Jessica is a mouse' then Jason is tired. It is probably the case that if 'Jessica is a mouse and Bernhard is yellow' then Sandra took the football.
It is unlikely that either 'Jessica is a mouse' or 'Brian is green' but not both.
It is unlikely that either 'Jessica is a mouse' or 'Brian is green' but not both.
It is highly likely that either 'Jessica is a mouse' or 'Brian is green' but not 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
  0.1::factA.
  0.75::factB.
  0.7::factC.
  %hop1
  0.8::factX:-or(factB,factA).
  0.2::factY:-and(factA,factB).
  0.7::factZ:-and(factB,factA).

  %hop2
  conclusion:-xor(factB,factX).

  query(conclusion).
  
Either 'Jessica is a mouse' or 'Brian is green' but not both.