It is impossible that Brian is a rhino. It is impossible that Sumit is thirsty. It is probable that Lily is yellow. It is probably not the case that if either 'Sumit is thirsty' or 'Brian is a rhino' but not both then Julius is white. It is highly unlikely that if either 'Brian is a rhino' or 'Sumit is thirsty' but not both then Bernhard is a frog. Chances are slight that if 'Sumit is thirsty' or 'Brian is a rhino' or both then John picked up the apple.
It is probably the case that 'Sumit is thirsty' or 'Brian is a rhino' or both.
It is impossible that 'Sumit is thirsty' or 'Brian is a rhino' or both.
It is probably the case that 'Sumit is thirsty' or 'Brian is a rhino' 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
  0.0::factA.
  0.0::factB.
  0.7::factC.
  %hop1
  0.25::factX:-xor(factB,factA).
  0.05::factY:-xor(factA,factB).
  0.1::factZ:-or(factB,factA).

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

  query(conclusion).
  
'Sumit is thirsty' or 'Brian is a rhino' or both.