12 %\fi

    12 %\fi

    13 

    13 

    14 \usepackage[section]{placeins}

    14 \usepackage[section]{placeins}

    15 \usepackage{leftidx}

    15 \usepackage{leftidx}

    16 \usepackage{stmaryrd} % additional math symbols, e.g. \mapsfrom

    16 \usepackage{stmaryrd} % additional math symbols, e.g. \mapsfrom

    17 

    18 

    18 \SelectTips{cm}{}

    19 \SelectTips{cm}{}

    19 % This may speed up compilation of complex documents with many xymatrices.

    20 % This may speed up compilation of complex documents with many xymatrices.

    20 %\CompileMatrices

    21 %\CompileMatrices

    21 

    22