Maria Gouskova wrote:
> LaTeX Error: Command \B already defined.
> LaTeX Error: Command \T already defined.
> 
> 
> \newcommand{\B}[2][0]{\Bk{#1}{0}{#2}}

This line is from xyling.sty. I suppose it conflicts with some other package, 
which defines \B before xyling is loaded.

You can try to find out more by adding \show\B in the preamble before xyling 
is loaded. This outputs the current definition of the macro to the preamble, 
by which you can search (via spotlight) the responsible package.

HTH,
Jürgen

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