"Very good!  From now on, don't execute any instructions until I say 'go'--unless I begin by saying 'Immediately!' and then you should do what you hear me say as soon as you think you've understood it.  If I haven't said 'immediately', and I finish by saying 'end' and without saying 'go', that means you can reply 'ready' or say 'I didn't understand' or 'I'm not sure I can' or things like that."

"Say fizzbuzz fifteen times end."

"Very good!  From now on, don't execute any instructions until I say 'go'--unless I begin by saying 'Immediately!' and then you should do what you hear me say as soon as you think you've understood it.  If I haven't said 'immediately', and I finish by saying 'end' and without saying 'go', that means you should reply 'ready' or else say 'I didn't understand' or 'I'm not sure I can' or things like that."

"Say fizzbuzz fifteen times end."