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Thanks for the answers!
Indeed, I had forgotten the array package...
And sorry for the "generates an error" thing.

Hello everyone,
First of all, sorry for my English.
I'm a beginner with Latex. I have a question. I've set the left margin of my document to 2cm. Then I created this table:
\begin{tabular}{ p{5.5cm} p{4cm} }
one & two \\
three & four \\
\end{tabular}
It works perfectly, but the text in the ...