Twenty year periods. Years. Months. Days. 1 0 3 4 8 17 -- -- -- -- 1 0 12 1 Third column on Plate 53_b_. 8 17 -- -- -- -- 1 1 2 18 Fourth column on Plate 53_b_. 8 17 -- -- -- -- 1 1 11 15 Fifth column on Plate 53_b_. 8 17 -- -- -- -- 1 2 2 12 First column on Plate 54_b_. 8 17 -- -- -- -- 1 2 11 9 Second column on Plate 54_b_. 8 17 -- -- -- -- 1 3 2 6 Third column on Plate 54_b_. 7 8 -- -- -- -- 1 3 9 14 Fourth column on Plate 54_b_. 8 17 -- -- -- -- 1 4 0 11 Fifth column on Plate 54_b_. 8 17 -- -- -- -- 1 4 0 8 First column on Plate 55_b_. 8 18[321-1] -- -- -- -- 1 5 0 6 Second column on Plate 55_b_. 8 17 -- -- -- -- 1 5 9 3 Third column on Plate 55_b_. 8 17 -- -- -- -- 1 6 0 0 Fourth column on Plate 55_b_. 8 17 -- -- -- -- 1 6 8 17 Fifth column on Plate 55_b_. 8 17 -- -- -- -- 1 6 17 14 Sixth column on Plate 55_b_. 8 17 -- -- -- -- 1 7 8 11 Seventh column on Plate 55_b_. 7 8 -- -- -- -- 1 7 15 19 Eighth column on Plate 55_b_. 8 17 -- -- -- -- 1 8 6 16 First column on Plate 56_b_. 8 18[321-2] -- -- -- -- 1 8 15 14 Second column on Plate 56_b_.