It is probably not the case that Greg is a rhino. We believe that Lily is green. There is a very good chance that Sandra took the apple. We doubt that if either 'Greg is a rhino' or 'Sandra took the apple' but not both then Bill got the milk there. We believe that if 'Greg is a rhino' or 'Sandra took the apple' or both then Julius is a swan. There is a very good chance that if 'Lily is green' or 'Greg is a rhino' or both then Mary left the football.
It is unlikely that 'Greg is a rhino and Sandra took the apple'.
It is unlikely that 'Greg is a rhino and Sandra took the apple'.
It is certain that 'Greg is a rhino and Sandra took the apple'.

  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
  0.25::factA.
  0.75::factB.
  0.8::factC.
  %hop1
  0.2::factX:-xor(factA,factC).
  0.75::factY:-or(factA,factC).
  0.8::factZ:-or(factB,factA).

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

  query(conclusion).
  
'Greg is a rhino and Sandra took the apple'.