It is highly likely that Brian is a swan. There is a very good chance that Lily is white. It is highly likely that Winona is a sheep. It is probably the case that if 'Winona is a sheep and Brian is a swan' then Sumit is thirsty. It is probably not the case that if 'Brian is a swan and Lily is white' then John put down the apple. It is highly likely that if 'Brian is a swan and Lily is white' then Greg is a frog.
There is a better than even chance that 'Sumit is thirsty and John put down the apple'.
It is improbable that 'Sumit is thirsty and John put down the apple'.
There is a better than even chance that 'Sumit is thirsty and John put down the apple'.

  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
  0.9::factA.
  0.8::factB.
  0.9::factC.
  %hop1
  0.7::factX:-and(factC,factA).
  0.25::factY:-and(factA,factB).
  0.9::factZ:-and(factA,factB).

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

  query(conclusion).
  
'Sumit is thirsty and John put down the apple'.