It is impossible that Lily is a rhino. It is probably the case that Bernhard is a frog. It is impossible that Daniel took the milk. There is little chance that if 'Daniel took the milk and Lily is a rhino' then Mary left the apple. It is highly unlikely that if either 'Lily is a rhino' or 'Bernhard is a frog' but not both then Greg is yellow. There is a better than even chance that if 'Daniel took the milk' or 'Bernhard is a frog' or both then John moved to the office.
It is almost certain that 'Greg is yellow' or 'Lily is a rhino' or both.
It is highly unlikely that 'Greg is yellow' or 'Lily is a rhino' or both.
It is almost certain that 'Greg is yellow' or 'Lily is a rhino' or both.

  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
  0.0::factA.
  0.7::factB.
  0.0::factC.
  %hop1
  0.1::factX:-and(factC,factA).
  0.05::factY:-xor(factA,factB).
  0.6::factZ:-or(factC,factB).

  %hop2
  conclusion:-or(factY,factA).

  query(conclusion).
  
'Greg is yellow' or 'Lily is a rhino' or both.