There is little chance that Julius is a frog. Chances are slight that Emily is a mouse. It is likely that Bernhard is a swan. It is probably not the case that if 'Bernhard is a swan and Julius is a frog' then Lily is a rhino. There is almost no chance that if either 'Bernhard is a swan' or 'Julius is a frog' but not both then Fred went to the garden. It is impossible that if either 'Emily is a mouse' or 'Bernhard is a swan' but not both then John left the football.
It is highly unlikely that 'Julius is a frog and Bernhard is a swan'.
It is highly unlikely that 'Julius is a frog and Bernhard is a swan'.
It is likely that 'Julius is a frog and Bernhard is a swan'.

  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
  0.1::factA.
  0.1::factB.
  0.7::factC.
  %hop1
  0.25::factX:-and(factC,factA).
  0.02::factY:-xor(factC,factA).
  0.0::factZ:-xor(factB,factC).

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

  query(conclusion).
  
'Julius is a frog and Bernhard is a swan'.