exploit create_cda(a)=
    preconditions:
        quality:a,critical=true;
        quality:a,digital=true;
    postconditions:
        insert quality:a,cda=true;
.

exploit expand_critical_1_1(a, b)=
     preconditions:
         quality:a,critical=true;
         topology:a->b,physical;
     postconditions:
         insert quality:b,critical=true;
.

exploit expand_critical_2_1(a, b)=
    preconditions:
        quality:a,critical=true;
        topology:b->a,physical;
    postconditions:
        insert quality:b,critical=true;
.

#exploit expand_critical_1_2(a, b)=
#    preconditions:
#        quality:a,critical=true;
#        topology:a<->b,physical;
#    postconditions:
#        insert quality:b,critical=true;
#.