We believe that Emily is a wolf. There is a better than even chance that Lily is a rhino. It is likely that Greg is a swan. We doubt that if 'Greg is a swan and Emily is a wolf' then Jessica is a sheep. It is certain that if 'Greg is a swan and Lily is a rhino' then John went to the garden. We believe that if 'Emily is a wolf and Lily is a rhino' then Mary dropped the apple.
It is probably not the case that 'Mary dropped the apple and Emily is a wolf'.
It is probably not the case that 'Mary dropped the apple and Emily is a wolf'.
It is almost certain that 'Mary dropped the apple and Emily is a wolf'.

  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
  0.75::factA.
  0.6::factB.
  0.7::factC.
  %hop1
  0.2::factX:-and(factC,factA).
  1.0::factY:-and(factC,factB).
  0.75::factZ:-and(factA,factB).

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

  query(conclusion).
  
'Mary dropped the apple and Emily is a wolf'.