It is probable that John dropped the apple. Chances are about even that Greg is white. We doubt that Lily is yellow. It is probable that if either 'Lily is yellow' or 'John dropped the apple' but not both then Brian is a rhino. We believe that if 'Greg is white and Lily is yellow' then Mary moved to the office. It is highly unlikely that if 'John dropped the apple and Greg is white' then Daniel put down the milk.
Chances are about even that 'Daniel put down the milk and John dropped the apple'.
There is almost no chance that 'Daniel put down the milk and John dropped the apple'.
Chances are about even that 'Daniel put down the milk and John dropped 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
  0.7::factA.
  0.5::factB.
  0.2::factC.
  %hop1
  0.7::factX:-xor(factC,factA).
  0.75::factY:-and(factB,factC).
  0.05::factZ:-and(factA,factB).

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

  query(conclusion).
  
'Daniel put down the milk and John dropped the apple'.