function c() {
    /^(((e())|(f)()|(l)|(g)|(h)|(j(()()()()))|(i())|(k)|(b(()()))|())|(()()(())(())(())()()()()(())()()((()()()))()()(())(())()()()((u))))+/
        .test()
}

for (var i = 0; i < 20; i++) {
  c()
}