Chances are slight that Lily is a frog. There is a very good chance that Brian is a rhino. It is probable that Mary went to the kitchen. Chances are about even that if either 'Mary went to the kitchen' or 'Lily is a frog' but not both then Emily is a mouse. It is probably not the case that if 'Brian is a rhino and Lily is a frog' then Bernhard is white. It is probable that if 'Lily is a frog' or 'Mary went to the kitchen' or both then John discarded the apple.
It is highly likely that 'Emily is a mouse and Brian is a rhino'.
It is probably not the case that 'Emily is a mouse and Brian is a rhino'.
It is highly likely that 'Emily is a mouse and Brian 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
  0.1::factA.
  0.8::factB.
  0.7::factC.
  %hop1
  0.5::factX:-xor(factC,factA).
  0.25::factY:-and(factB,factA).
  0.7::factZ:-or(factA,factC).

  %hop2
  conclusion:-and(factX,factB).

  query(conclusion).
  
'Emily is a mouse and Brian is a rhino'.