There is almost no chance that Greg is a rhino. We doubt that Jeff left the apple. It is likely that Bernhard is a swan. It is impossible that if 'Greg is a rhino and Bernhard is a swan' then Bill went to the kitchen. It is almost certain that if 'Bernhard is a swan and Jeff left the apple' then Sandra took the football. It is improbable that if 'Bernhard is a swan and Jeff left the apple' then Mary moved to the garden.
It is impossible that 'Bill went to the kitchen and Greg is a rhino'.
It is impossible that 'Bill went to the kitchen and Greg is a rhino'.
There is a better than even chance that 'Bill went to the kitchen 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
  0.02::factA.
  0.2::factB.
  0.7::factC.
  %hop1
  0.0::factX:-and(factA,factC).
  0.95::factY:-and(factC,factB).
  0.1::factZ:-and(factC,factB).

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

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