exemple2

The subject which is to us propos¨&brvbar is as follows: calculation of the degr¨&brvbar d&iexcl &ma

(dr1 :- di1, not dr2., 100)
(dr2 :- di2, not dr1., 100)
(c1 :- dr1, di1., 70)
(c2 :- dr2, di2., 30)
(di1., 90)
(di2., 70)