a = B.C. b = B.C. c = B.C. d = B.C. e = 1st Century f = 2nd Century g = 3rd Century h = 4th Century i = 5th Century j = 6th Century k = 7th Century l = 8th Century m = 9th Century n = 10th Century o = 11th Century p = 12th Century q = 13th Century r = 14th Century s = 15th Century t = 16th Century u = 17th Century v = 18th Century v0 = 1700's v1 = 1710's v2 = 1720's v3 = 1730's v4 = 1740's v5 = 1750's v6 = 1760's v7 = 1770's v8 = 1780's v9 = 1790's w = 19th Century w0 = 1800's w1 = 1810's w2 = 1820's w3 = 1830's w4 = 1840's w5 = 1850's w6 = 1860's w7 = 1870's w8 = 1880's w9 = 1890's x = 20th Century x0 = 1900's x1 = 1910's x2 = 1920's x3 = 1930's x4 = 1940's x5 = 1950's x6 = 1960's x7 = 1970's x8 = 1980's x9 = 1990's y = 21th Century y0 = 2000's