If 'Pen' is 'Bed', 'Bed' is 'Fan', 'Fan' is 'Chair', and 'Chair' is 'Roof' on what is man sleep?
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For word coding (substitute meaning) questions:
\begin{itemize}
\item \textbf{Identify the Real Action/Object:} First, determine the actual object or action being referred to in the question (e.g., where does a man sleep? - on a bed).
\item \textbf{Find the Coded Equivalent:} Then, look for what that real object/action is called in the given coded language. Do not get confused by previous or subsequent assignments; only the direct coding of the real object/action matters.
\end{itemize}
Step 1: Determine the actual object used for the action mentioned in the question.
The question asks, "on what is man sleep?".
In reality, a man sleeps on a Bed. Step 2: Find the coded name for the actual object from the given statements.
The problem provides a series of coded equivalences:
'Pen' is 'Bed'
'Bed' is 'Fan'
'Fan' is 'Chair'
'Chair' is 'Roof'
Since a man actually sleeps on a 'Bed', and according to the given code, 'Bed' is called 'Fan', the answer in this coded language is 'Fan'.
The final answer is $\boxed{\text{(3)}}$.