Chances are slight that Sumit is bored. There is a better than even chance that Jeff went to the bedroom. Chances are slight that Sandra dropped the milk. It is probable that if 'Sandra dropped the milk and Jeff went to the bedroom' then John left the football. It is likely that if 'Sandra dropped the milk' or 'Sumit is bored' or both then Mary put down the apple. We believe that if 'Sumit is bored and Sandra dropped the milk' then Bernhard is yellow.
Chances are slight that either 'Sumit is bored' or 'Mary put down the apple' but not both.
Chances are slight that either 'Sumit is bored' or 'Mary put down the apple' but not both.
It is likely that either 'Sumit is bored' or 'Mary put down the apple' but not 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
  0.1::factA.
  0.6::factB.
  0.1::factC.
  %hop1
  0.7::factX:-and(factC,factB).
  0.7::factY:-or(factC,factA).
  0.75::factZ:-and(factA,factC).

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

  query(conclusion).
  
Either 'Sumit is bored' or 'Mary put down the apple' but not both.