\ProvidesPackage{cols}[97/04/03 tabularx columns B, Y, R and C]

\RequirePackage{tabularx}

% See page 114 of The \LaTeX Companion.
\newcolumntype{B}{>{\centering\arraybackslash\bfseries}X}
\newcolumntype{C}{>{\centering\arraybackslash}X}
\newcolumntype{Y}{>{\raggedright\arraybackslash}X}
\newcolumntype{R}{>{\raggedleft\arraybackslash}X}
\setlength{\extrarowheight}{4pt}