There is a better than even chance that Sumit is thirsty. Chances are about even that Julius is a lion. It is probably the case that Bernhard is a frog. It is unlikely that if 'Julius is a lion and Sumit is thirsty' then John moved to the garden. It is improbable that if either 'Bernhard is a frog' or 'Sumit is thirsty' but not both then Mary dropped the milk. There is little chance that if either 'Julius is a lion' or 'Sumit is thirsty' but not both then Greg is a swan.
It is probably the case that 'Bernhard is a frog' or 'Mary dropped the milk' or both.
It is probably the case that 'Bernhard is a frog' or 'Mary dropped the milk' or both.
Chances are slight that 'Bernhard is a frog' or 'Mary dropped the milk' 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
  0.6::factA.
  0.5::factB.
  0.7::factC.
  %hop1
  0.2::factX:-and(factB,factA).
  0.1::factY:-xor(factC,factA).
  0.1::factZ:-xor(factB,factA).

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

  query(conclusion).
  
'Bernhard is a frog' or 'Mary dropped the milk' or both.