There is a better than even chance that Julius is a lion. There is a very good chance that Daniel dropped the apple. It is almost certain that Bernhard is a rhino. It is highly unlikely that if either 'Julius is a lion' or 'Bernhard is a rhino' but not both then Sandra took the football. It is probably not the case that if 'Bernhard is a rhino' or 'Julius is a lion' or both then Mary moved to the garden. Chances are slight that if 'Daniel dropped the apple' or 'Julius is a lion' or both then John left the football.
It is improbable that 'Julius is a lion and Mary moved to the garden'.
It is improbable that 'Julius is a lion and Mary moved to the garden'.
It is certain that 'Julius is a lion and Mary moved to the garden'.

  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.
  0.8::factB.
  0.95::factC.
  %hop1
  0.05::factX:-xor(factA,factC).
  0.25::factY:-or(factC,factA).
  0.1::factZ:-or(factB,factA).

  %hop2
  conclusion:-and(factA,factY).

  query(conclusion).
  
'Julius is a lion and Mary moved to the garden'.