It is probably not the case that Lily is a frog. It is probably not the case that Julius is gray. There is a very good chance that Greg is a rhino. It is highly unlikely that if 'Greg is a rhino' or 'Lily is a frog' or both then Brian is yellow. We believe that if 'Julius is gray' or 'Lily is a frog' or both then Daniel left the milk. There is a better than even chance that if either 'Julius is gray' or 'Lily is a frog' but not both then Mary went to the office.
There is a very good chance that 'Lily is a frog and Mary went to the office'.
It is improbable that 'Lily is a frog and Mary went to the office'.
There is a very good chance that 'Lily is a frog and Mary went to the office'.

  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
  0.25::factA.
  0.25::factB.
  0.8::factC.
  %hop1
  0.05::factX:-or(factC,factA).
  0.75::factY:-or(factB,factA).
  0.6::factZ:-xor(factB,factA).

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

  query(conclusion).
  
'Lily is a frog and Mary went to the office'.