It is likely that Brian is a frog. Chances are slight that Sumit is tired. It is probably not the case that Jessica is a wolf. It is likely that if 'Jessica is a wolf' or 'Sumit is tired' or both then Sandra took the football. It is certain that if either 'Brian is a frog' or 'Jessica is a wolf' but not both then Greg is yellow. Chances are about even that if either 'Sumit is tired' or 'Brian is a frog' but not both then Mary went to the garden.
It is likely that 'Mary went to the garden' or 'Brian is a frog' or both.
It is likely that 'Mary went to the garden' or 'Brian is a frog' or both.
It is improbable that 'Mary went to the garden' or 'Brian is a frog' 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
  0.7::factA.
  0.1::factB.
  0.25::factC.
  %hop1
  0.7::factX:-or(factC,factB).
  1.0::factY:-xor(factA,factC).
  0.5::factZ:-xor(factB,factA).

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

  query(conclusion).
  
'Mary went to the garden' or 'Brian is a frog' or both.