It is improbable that Greg is a lion. It is unlikely that Daniel got the football. It is probably the case that Brian is yellow. It is unlikely that if either 'Greg is a lion' or 'Brian is yellow' but not both then Lily is a rhino. It is probably the case that if either 'Brian is yellow' or 'Greg is a lion' but not both then Bernhard is a swan. It is unlikely that if 'Greg is a lion and Daniel got the football' then John discarded the apple.
It is highly unlikely that 'Brian is yellow and Greg is a lion'.
It is highly unlikely that 'Brian is yellow and Greg is a lion'.
It is probable that 'Brian is yellow and Greg is a lion'.

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

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

  query(conclusion).
  
'Brian is yellow and Greg is a lion'.