It is impossible that Greg is a frog. It is probable that Lily is a rhino. It is highly unlikely that John went to the office. It is impossible that if 'Lily is a rhino' or 'John went to the office' or both then Julius is white. It is improbable that if 'John went to the office' or 'Greg is a frog' or both then Jeff left the apple. It is highly unlikely that if 'Lily is a rhino and Greg is a frog' then Sandra is in the kitchen.
There is a better than even chance that 'Julius is white and Jeff left the apple'.
It is impossible that 'Julius is white and Jeff left the apple'.
There is a better than even chance that 'Julius is white and Jeff left the apple'.

  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
  0.0::factA.
  0.7::factB.
  0.05::factC.
  %hop1
  0.0::factX:-or(factB,factC).
  0.1::factY:-or(factC,factA).
  0.05::factZ:-and(factB,factA).

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

  query(conclusion).
  
'Julius is white and Jeff left the apple'.