We believe that Emily is a mouse. Chances are slight that Lily is a rhino. It is highly unlikely that Julius is a frog. We believe that if 'Emily is a mouse' or 'Lily is a rhino' or both then Daniel left the milk. There is little chance that if either 'Emily is a mouse' or 'Lily is a rhino' but not both then Bernhard is a swan. There is almost no chance that if 'Lily is a rhino' or 'Julius is a frog' or both then Brian is green.
It is likely that 'Brian is green and Julius is a frog'.
It is impossible that 'Brian is green and Julius is a frog'.
It is likely that 'Brian is green and Julius is a frog'.

  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
  0.75::factA.
  0.1::factB.
  0.05::factC.
  %hop1
  0.75::factX:-or(factA,factB).
  0.1::factY:-xor(factA,factB).
  0.02::factZ:-or(factB,factC).

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

  query(conclusion).
  
'Brian is green and Julius is a frog'.