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# Long description

Figure 24 A hexagonal grid extends from the left-hand side of the figure. On the left, most of the edges of the hexagons are single lines, but moving to the right, most of the hexagons have double lines on two or three of their edges. At the top right edge, two adjacent corners of one hexagon have lines going to 'O H'. Further down one corner of a hexagon has a line to a 'C O subscript 2 H'. Near the lower right, one corner of a hexagon has a double line to an 'O'.