It is highly unlikely that Emily is a wolf. There is a very good chance that Julius is a rhino. There is almost no chance that Jeff moved to the garden. It is unlikely that if 'Julius is a rhino' or 'Jeff moved to the garden' or both then Yann is tired. Chances are about even that if 'Emily is a wolf and Jeff moved to the garden' then John took the football. It is impossible that if 'Emily is a wolf and Jeff moved to the garden' then Mary dropped the milk.
It is probably not the case that 'Julius is a rhino' or 'Yann is tired' or both.
There is a very good chance that 'Julius is a rhino' or 'Yann is tired' or both.
It is probably not the case that 'Julius is a rhino' or 'Yann is tired' 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
  0.05::factA.
  0.8::factB.
  0.02::factC.
  %hop1
  0.2::factX:-or(factB,factC).
  0.5::factY:-and(factA,factC).
  0.0::factZ:-and(factA,factC).

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

  query(conclusion).
  
'Julius is a rhino' or 'Yann is tired' or both.