It is certain that Emily is a cat. We believe that Julius is a rhino. It is highly unlikely that John discarded the apple. It is probably not the case that if 'Julius is a rhino and Emily is a cat' then Sumit is hungry. It is improbable that if either 'Emily is a cat' or 'Julius is a rhino' but not both then Greg is a frog. It is certain that if 'Julius is a rhino and Emily is a cat' then Gertrude is a mouse.
There is almost no chance that 'Emily is a cat and Greg is a frog'.
There is almost no chance that 'Emily is a cat and Greg is a frog'.
It is probable that 'Emily is a cat and Greg is a frog'.

  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.
  0.75::factB.
  0.05::factC.
  %hop1
  0.25::factX:-and(factB,factA).
  0.1::factY:-xor(factA,factB).
  1.0::factZ:-and(factB,factA).

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

  query(conclusion).
  
'Emily is a cat and Greg is a frog'.