Nested JQL

string [] tasks;
string [] stories;
string [] epics = selectIssues("issueType = 'Epic' AND project = " + argv[0]);
for(string e in epics) {
    string [] stry = allLinkedIssues(e, "Epic-Story Link");
    for(string s in stry) {
        string [] tsk = allLinkedIssues(s, "jira_subtask_link", 1);
        tasks += tsk;
    }
    stories += stry;
}
string [] results;
results = arrayUnion(epics, stories);
results = arrayUnion(results, tasks);
return results;