It is impossible that John moved to the office. There is almost no chance that Gertrude is a sheep. It is certain that Brian is a rhino. It is probably the case that if either 'Brian is a rhino' or 'Gertrude is a sheep' but not both then Jeff put down the milk. It is highly likely that if 'Brian is a rhino and John moved to the office' then Lily is white. Chances are about even that if either 'Gertrude is a sheep' or 'John moved to the office' but not both then Sandra dropped the milk.
There is a very good chance that 'John moved to the office and Brian is a rhino'.
It is impossible that 'John moved to the office and Brian is a rhino'.
There is a very good chance that 'John moved to the office and Brian is a rhino'.

  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.
  0.02::factB.
  1.0::factC.
  %hop1
  0.7::factX:-xor(factC,factB).
  0.9::factY:-and(factC,factA).
  0.5::factZ:-xor(factB,factA).

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

  query(conclusion).
  
'John moved to the office and Brian is a rhino'.