rule "remove_single_field"
when true
then
  set_field(field: "a.1", value: "a.1");
  set_field(field: "a_1", value: "a_1");
  set_field(field: "f1", value: "f1");
  set_field(field: "f2", value: "f2");

  remove_single_field(field:"a.1");
  remove_single_field(field:"f1");

  // invalid - should be NO-OP
  remove_single_field(field:"f.");
  remove_single_field(field:"dummy");
end
