class LaunchChecklist {

    List<String> checks = Arrays.asList("Cabin Pressure", 
            "Communication", 
            "Engine");

    Status prepareForTakeoff(Commander commander) { 
        for (int i = 0; i < checks.size(); i++) {
            boolean shouldAbortTakeoff = commander.isFailing(checks.get(i)); 
            if (shouldAbortTakeoff) {
                return Status.ABORT_TAKE_OFF; 
            }
        }
        return Status.READY_FOR_TAKE_OFF; 
    }
}