##Block alignment
##block alignment left right top bottom
##Use the 'top', 'bottom', 'left' and 'right' attributes to align a block's side to the side of another block.##The 'use col;' line applies the 'col' style to the running style, which makes blocks be laid out to-to-bottom instead of left-to-right.
use col; 
row {
    box A: Alpha;
    box B: Beta;
    box C: Gamma;
}
row {
    box M [left=A];
    box N;
    box O [right=C];
}

