Some routines navigate around a table or grid using “galley” order. Galley order is row-major order with one difference: cells that are spanned and which are not the master cell are omitted entirely. The basic progression (start with upper-left cell, continue from left to right in each row, process rows from top to bottom, ending with the lower-right cell) is the same, we just skip cells whose content is uninteresting because they're neither unspanned nor the master cell of a multicell.