There is little chance that John went to the kitchen. It is impossible that Brian is yellow. It is certain that Emily is a mouse. It is probably not the case that if 'John went to the kitchen' or 'Emily is a mouse' or both then Jason is tired. We believe that if 'Brian is yellow and Emily is a mouse' then Greg is a frog. It is probably the case that if 'Emily is a mouse' or 'John went to the kitchen' or both then Sandra got the football.
It is likely that 'Sandra got the football and Emily is a mouse'.
It is likely that 'Sandra got the football and Emily is a mouse'.
It is impossible that 'Sandra got the football and Emily is a mouse'.

  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.
  0.0::factB.
  1.0::factC.
  %hop1
  0.25::factX:-or(factA,factC).
  0.75::factY:-and(factB,factC).
  0.7::factZ:-or(factC,factA).

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

  query(conclusion).
  
'Sandra got the football and Emily is a mouse'.