sink: "{ S[] -> a[] }"
may_source: "{ T[i] -> a[] : 0 <= i <= 9 }"
kill: "{ K[] -> a[] }"
schedule:
  domain: "{ T[i]; S[]; K[] }"
  child:
    sequence:
    - filter: "{ T[i]; K[] }"
      child:
        schedule: "[{ T[i] -> [(i)]; K[] -> [(4)] }]"
    - filter: "{ S[] }"