There is a better than even chance that Julius is a frog. Chances are slight that Greg is yellow. Chances are about even that Emily is a wolf. There is little chance that if either 'Greg is yellow' or 'Julius is a frog' but not both then Antoine is thirsty. It is unlikely that if 'Julius is a frog and Greg is yellow' then Bernhard is a swan. It is certain that if either 'Julius is a frog' or 'Greg is yellow' but not both then Sandra left the football.
It is probable that 'Emily is a wolf and Sandra left the football'.
It is probably not the case that 'Emily is a wolf and Sandra left the football'.
It is probable that 'Emily is a wolf and Sandra left the football'.

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

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

  query(conclusion).
  
'Emily is a wolf and Sandra left the football'.