It is impossible that Bill moved to the office. There is almost no chance that Mary left the football. It is highly likely that Gertrude is a mouse. There is little chance that if either 'Gertrude is a mouse' or 'Mary left the football' but not both then Lily is yellow. It is certain that if 'Mary left the football and Bill moved to the office' then Greg is a swan. There is a better than even chance that if 'Gertrude is a mouse and Mary left the football' then Bernhard is a frog.
It is probably the case that 'Bill moved to the office' or 'Bernhard is a frog' or both.
There is almost no chance that 'Bill moved to the office' or 'Bernhard is a frog' or both.
It is probably the case that 'Bill moved to the office' or 'Bernhard is a frog' or both.

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

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

  query(conclusion).
  
'Bill moved to the office' or 'Bernhard is a frog' or both.