It is probable that Jeff moved to the garden. It is improbable that Greg is yellow. It is certain that Brian is a frog. We believe that if 'Brian is a frog and Greg is yellow' then Lily is a lion. It is highly likely that if either 'Jeff moved to the garden' or 'Brian is a frog' but not both then Emily is a mouse. There is little chance that if either 'Greg is yellow' or 'Brian is a frog' but not both then Bill left the milk.
There is almost no chance that 'Emily is a mouse and Bill left the milk'.
There is almost no chance that 'Emily is a mouse and Bill left the milk'.
It is probable that 'Emily is a mouse and Bill left the milk'.

  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.
  0.1::factB.
  1.0::factC.
  %hop1
  0.75::factX:-and(factC,factB).
  0.9::factY:-xor(factA,factC).
  0.1::factZ:-xor(factB,factC).

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

  query(conclusion).
  
'Emily is a mouse and Bill left the milk'.