Chances are about even that Julius is green. It is unlikely that Sandra left the football. There is little chance that Emily is a cat. It is probable that if 'Emily is a cat' or 'Julius is green' or both then Greg is a lion. There is a better than even chance that if either 'Julius is green' or 'Sandra left the football' but not both then Bernhard is a swan. It is impossible that if 'Sandra left the football' or 'Julius is green' or both then Mary went to the garden.
It is probably not the case that 'Emily is a cat' or 'Sandra left the football' or both.
It is probably not the case that 'Emily is a cat' or 'Sandra left the football' or both.
It is probable that 'Emily is a cat' or 'Sandra left the football' 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
  0.5::factA.
  0.2::factB.
  0.1::factC.
  %hop1
  0.7::factX:-or(factC,factA).
  0.6::factY:-xor(factA,factB).
  0.0::factZ:-or(factB,factA).

  %hop2
  conclusion:-or(factC,factB).

  query(conclusion).
  
'Emily is a cat' or 'Sandra left the football' or both.