We doubt that John left the football. There is almost no chance that Brian is green. There is almost no chance that Lily is a swan. We doubt that if 'John left the football and Lily is a swan' then Yann is tired. There is a better than even chance that if either 'Brian is green' or 'Lily is a swan' but not both then Julius is a rhino. We believe that if 'John left the football' or 'Lily is a swan' or both then Mary moved to the garden.
There is a better than even chance that 'Yann is tired and Mary moved to the garden'.
It is impossible that 'Yann is tired and Mary moved to the garden'.
There is a better than even chance that 'Yann is tired and Mary moved to the garden'.

  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
  0.2::factA.
  0.02::factB.
  0.02::factC.
  %hop1
  0.2::factX:-and(factA,factC).
  0.6::factY:-xor(factB,factC).
  0.75::factZ:-or(factA,factC).

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

  query(conclusion).
  
'Yann is tired and Mary moved to the garden'.