There is a better than even chance that Emily is a wolf. It is probably the case that Jessica is a cat. It is impossible that Mary went to the hallway. It is probably not the case that if 'Mary went to the hallway and Jessica is a cat' then Julius is a swan. We believe that if 'Mary went to the hallway' or 'Jessica is a cat' or both then Brian is a frog. It is probably the case that if 'Jessica is a cat' or 'Mary went to the hallway' or both then Jason is tired.
Chances are about even that 'Julius is a swan and Jason is tired'.
It is impossible that 'Julius is a swan and Jason is tired'.
Chances are about even that 'Julius is a swan and Jason is tired'.

  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
  0.6::factA.
  0.7::factB.
  0.0::factC.
  %hop1
  0.25::factX:-and(factC,factB).
  0.75::factY:-or(factC,factB).
  0.7::factZ:-or(factB,factC).

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

  query(conclusion).
  
'Julius is a swan and Jason is tired'.