There is little chance that Mary left the apple. It is likely that Bernhard is a frog. It is improbable that Emily is a wolf. It is probably not the case that if 'Bernhard is a frog and Mary left the apple' then Lily is a rhino. There is a better than even chance that if 'Bernhard is a frog and Emily is a wolf' then John dropped the milk. It is likely that if 'Bernhard is a frog' or 'Emily is a wolf' or both then Brian is green.
It is probable that 'Bernhard is a frog' or 'Lily is a rhino' or both.
It is probable that 'Bernhard is a frog' or 'Lily is a rhino' or both.
It is probably not the case that 'Bernhard is a frog' 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
  0.1::factA.
  0.7::factB.
  0.1::factC.
  %hop1
  0.25::factX:-and(factB,factA).
  0.6::factY:-and(factB,factC).
  0.7::factZ:-or(factB,factC).

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

  query(conclusion).
  
'Bernhard is a frog' or 'Lily is a rhino' or both.