It is probably not the case that John left the football. We doubt that Emily is a mouse. It is unlikely that Greg is a frog. We doubt that if 'Greg is a frog and Emily is a mouse' then Winona is a wolf. We doubt that if either 'Greg is a frog' or 'Emily is a mouse' but not both then Lily is yellow. It is certain that if 'Emily is a mouse' or 'John left the football' or both then Mary grabbed the milk.
It is probably not the case that 'Lily is yellow' or 'Emily is a mouse' or both.
It is probably not the case that 'Lily is yellow' or 'Emily is a mouse' or both.
It is probably the case that 'Lily is yellow' or 'Emily is a mouse' 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
  0.25::factA.
  0.2::factB.
  0.2::factC.
  %hop1
  0.2::factX:-and(factC,factB).
  0.2::factY:-xor(factC,factB).
  1.0::factZ:-or(factB,factA).

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

  query(conclusion).
  
'Lily is yellow' or 'Emily is a mouse' or both.