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Thank you for your reply.

You are totally right. Latex doesnot permet the use of parameters in its ending part of definition. Maybe it's a designing issue who knows.

Thank you.

Sorry I had forgotten posting error messages:

ERROR: Illegal parameter number in definition of \endadd_head_tail.

--- TeX said ---
<to be read again>
2
l.10 ...}[2]{Head of \emph{#1}}{Head of \emph{#2}}

--- HELP ---
This is probably caused by a \newcommand, \renewcommand,
\newenvironment, or ...

Hello everyone,

Here is my first question. I am a newbie and trying out the newenvironment.

The following newenvironment does not compile. Anyone can explain me why? Thanks a lot.