The K-map for 3 variables is plotted above. You will notice the column for 11 and 10 is inter-changed. This is done to allow only one variable to change across adjacent cells. This adjustment in columns allows in minimization of logic mapped into tables.
Any adjacent 1, 2, 4 or 8 cells can be grouped to find a minimized logic value.
Following plot will show grouping of adjacent cells.