We doubt that Greg is a lion. Chances are about even that Emily is a wolf. It is probably the case that Mary went to the office. It is probably not the case that if 'Greg is a lion and Mary went to the office' then John moved to the office. It is certain that if either 'Greg is a lion' or 'Mary went to the office' but not both then Lily is yellow. There is a very good chance that if 'Emily is a wolf' or 'Greg is a lion' or both then Bernhard is a rhino.
We doubt that 'Bernhard is a rhino' or 'Lily is yellow' or both.
There is a very good chance that 'Bernhard is a rhino' or 'Lily is yellow' or both.
We doubt that 'Bernhard is a rhino' or 'Lily 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
  0.2::factA.
  0.5::factB.
  0.7::factC.
  %hop1
  0.25::factX:-and(factA,factC).
  1.0::factY:-xor(factA,factC).
  0.8::factZ:-or(factB,factA).

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

  query(conclusion).
  
'Bernhard is a rhino' or 'Lily is yellow' or both.