The genitive bit is often optionally omissible with nouns, though not with pronouns ( specifically, not with first and second person genitive pronouns, because, as will be seen, they have no outward, distinct, separable " ?/s>Sorting by a column that has the omissible 0 on the right makes the factorial numbers in that column correspond to the index numbers in the immovable column on the left . The small columns are reflections of the columns next to them, and can be used to bring those in colexicographic order.