It is certain that Emily is a sheep. It is probably the case that Greg is a lion. It is probable that Lily is yellow. It is certain that if either 'Greg is a lion' or 'Lily is yellow' but not both then Jeff left the apple. It is highly unlikely that if 'Lily is yellow and Greg is a lion' then Brian is a swan. It is probable that if 'Greg is a lion and Emily is a sheep' then Bernhard is a frog.
It is certain that 'Emily is a sheep' or 'Bernhard is a frog' or both.
It is certain that 'Emily is a sheep' or 'Bernhard is a frog' or both.
There is almost no chance that 'Emily is a sheep' or 'Bernhard 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
  1.0::factA.
  0.7::factB.
  0.7::factC.
  %hop1
  1.0::factX:-xor(factB,factC).
  0.05::factY:-and(factC,factB).
  0.7::factZ:-and(factB,factA).

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

  query(conclusion).
  
'Emily is a sheep' or 'Bernhard is a frog' or both.