There is a very good chance that Daniel dropped the apple. It is almost certain that Brian is a frog. There is little chance that John took the football. It is impossible that if either 'Daniel dropped the apple' or 'Brian is a frog' but not both then Greg is a lion. It is probable that if 'John took the football' or 'Daniel dropped the apple' or both then Mary went to the office. There is a very good chance that if 'Daniel dropped the apple and John took the football' then Lily is green.
It is certain that 'Daniel dropped the apple' or 'Brian is a frog' or both.
It is certain that 'Daniel dropped the apple' or 'Brian is a frog' or both.
Chances are slight that 'Daniel dropped the apple' or 'Brian 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
  0.8::factA.
  0.95::factB.
  0.1::factC.
  %hop1
  0.0::factX:-xor(factA,factB).
  0.7::factY:-or(factC,factA).
  0.8::factZ:-and(factA,factC).

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

  query(conclusion).
  
'Daniel dropped the apple' or 'Brian is a frog' or both.