There is a better than even chance that Mary picked up the apple. It is probable that Sandra left the football. It is almost certain that Bernhard is yellow. It is unlikely that if 'Bernhard is yellow' or 'Sandra left the football' or both then Julius is green. We believe that if 'Mary picked up the apple and Sandra left the football' then Daniel grabbed the milk. It is impossible that if either 'Bernhard is yellow' or 'Mary picked up the apple' but not both then John went to the office.
It is almost certain that 'Sandra left the football and Mary picked up the apple'.
Chances are about even that 'Sandra left the football and Mary picked up the apple'.
It is almost certain that 'Sandra left the football and Mary picked up 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
  0.6::factA.
  0.7::factB.
  0.95::factC.
  %hop1
  0.2::factX:-or(factC,factB).
  0.75::factY:-and(factA,factB).
  0.0::factZ:-xor(factC,factA).

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

  query(conclusion).
  
'Sandra left the football and Mary picked up the apple'.