Chances are about even that Greg is a rhino. It is almost certain that Daniel took the apple. It is probable that Bernhard is a frog. It is improbable that if either 'Bernhard is a frog' or 'Daniel took the apple' but not both then John moved to the garden. There is little chance that if 'Bernhard is a frog and Daniel took the apple' then Mary went to the office. It is highly unlikely that if either 'Bernhard is a frog' or 'Daniel took the apple' but not both then Fred left the football.
It is probably the case that 'Bernhard is a frog and Greg is a rhino'.
It is probably not the case that 'Bernhard is a frog and Greg is a rhino'.
It is probably the case that 'Bernhard is a frog 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
  0.5::factA.
  0.95::factB.
  0.7::factC.
  %hop1
  0.1::factX:-xor(factC,factB).
  0.1::factY:-and(factC,factB).
  0.05::factZ:-xor(factC,factB).

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

  query(conclusion).
  
'Bernhard is a frog and Greg is a rhino'.