There is little chance that Brian is a frog. Chances are slight that Julius is a rhino. We believe that Mary moved to the garden. It is probably the case that if 'Brian is a frog' or 'Mary moved to the garden' or both then John grabbed the milk. It is almost certain that if 'Julius is a rhino' or 'Brian is a frog' or both then Daniel dropped the apple. There is almost no chance that if either 'Julius is a rhino' or 'Mary moved to the garden' but not both then Lily is a swan.
Chances are slight that 'Brian is a frog and Mary moved to the garden'.
Chances are slight that 'Brian is a frog and Mary moved to the garden'.
We believe that 'Brian is a frog 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
  0.1::factA.
  0.1::factB.
  0.75::factC.
  %hop1
  0.7::factX:-or(factA,factC).
  0.95::factY:-or(factB,factA).
  0.02::factZ:-xor(factB,factC).

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

  query(conclusion).
  
'Brian is a frog and Mary moved to the garden'.