It is probable that Daniel got the football. It is probably not the case that Yann is hungry. It is certain that Lily is a rhino. There is a very good chance that if 'Daniel got the football and Yann is hungry' then Jeff moved to the garden. It is probably not the case that if 'Lily is a rhino' or 'Daniel got the football' or both then Greg is a lion. Chances are about even that if either 'Lily is a rhino' or 'Daniel got the football' but not both then Julius is a frog.
There is a very good chance that 'Daniel got the football' or 'Julius is a frog' or both.
There is a very good chance that 'Daniel got the football' or 'Julius is a frog' or both.
It is highly unlikely that 'Daniel got the football' or 'Julius 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
  0.7::factA.
  0.25::factB.
  1.0::factC.
  %hop1
  0.8::factX:-and(factA,factB).
  0.25::factY:-or(factC,factA).
  0.5::factZ:-xor(factC,factA).

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

  query(conclusion).
  
'Daniel got the football' or 'Julius is a frog' or both.