It is probable that Jessica is a wolf. It is highly likely that Brian is a rhino. It is almost certain that Greg is yellow. There is a very good chance that if 'Brian is a rhino' or 'Greg is yellow' or both then Bernhard is a swan. It is highly unlikely that if either 'Brian is a rhino' or 'Jessica is a wolf' but not both then John left the football. It is probable that if 'Greg is yellow and Jessica is a wolf' then Mary went to the hallway.
It is highly likely that 'Mary went to the hallway' or 'Bernhard is a swan' or both.
It is highly likely that 'Mary went to the hallway' or 'Bernhard is a swan' or both.
It is improbable that 'Mary went to the hallway' or 'Bernhard is a swan' 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
  0.7::factA.
  0.9::factB.
  0.95::factC.
  %hop1
  0.8::factX:-or(factB,factC).
  0.05::factY:-xor(factB,factA).
  0.7::factZ:-and(factC,factA).

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

  query(conclusion).
  
'Mary went to the hallway' or 'Bernhard is a swan' or both.