〔R47〕  Take away my first letter and I remain unchanged; take away my second letter and I remain unchanged; take away my third letter and I remain unchanged; take away all my letters and still I remain exactly the same.

〔譯註〕 拿走我的  first letter，我仍然不變；拿走我的  second letter，我仍然不變；拿走我的  third letter，我仍然不變；拿走我所有的  letters，我還是仍然恰恰一樣。

 註：letter  指「字母」或「信」。

〔提問〕 If I am a delivery man (送東西的人), what am I?

〔謎底〕 p______ 或 m______