It is certain that Bernhard is a lion. Chances are slight that Bill went to the garden. Chances are slight that Greg is a rhino. We doubt that if 'Bernhard is a lion and Bill went to the garden' then Sandra took the football. There is little chance that if 'Bernhard is a lion and Greg is a rhino' then Brian is a swan. Chances are slight that if 'Bernhard is a lion and Greg is a rhino' then John left the apple.
It is highly likely that 'Bill went to the garden and Greg is a rhino'.
There is almost no chance that 'Bill went to the garden and Greg is a rhino'.
It is highly likely that 'Bill went to the garden and Greg is a rhino'.

  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
  1.0::factA.
  0.1::factB.
  0.1::factC.
  %hop1
  0.2::factX:-and(factA,factB).
  0.1::factY:-and(factA,factC).
  0.1::factZ:-and(factA,factC).

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

  query(conclusion).
  
'Bill went to the garden and Greg is a rhino'.