It is improbable that Jessica is a sheep. It is probable that Lily is green. It is almost certain that Bernhard is a frog. It is improbable that if 'Jessica is a sheep' or 'Lily is green' or both then Brian is a rhino. It is improbable that if either 'Lily is green' or 'Bernhard is a frog' but not both then Mary went to the office. There is a better than even chance that if 'Bernhard is a frog and Lily is green' then Greg is a swan.
It is almost certain that either 'Mary went to the office' or 'Brian is a rhino' but not both.
There is little chance that either 'Mary went to the office' or 'Brian is a rhino' but not both.
It is almost certain that either 'Mary went to the office' or 'Brian is a rhino' 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.
  0.7::factB.
  0.95::factC.
  %hop1
  0.1::factX:-or(factA,factB).
  0.1::factY:-xor(factB,factC).
  0.6::factZ:-and(factC,factB).

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

  query(conclusion).
  
Either 'Mary went to the office' or 'Brian is a rhino' but not both.