Orders the variables of a polynomial OI-algebra according to $x_{i',j'} < x_{i,j}$ if $j'>j$ or $j'=j$ and $i'>i$.
The object ColDownRowDown is a symbol.
The source of this document is in /__w/M2/M2/macaulay2-1.26.05+ds/M2/Macaulay2/packages/OIGroebnerBases.m2:1438:0.