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+#!/usr/bin/ruby
+
+#
+# See ../README.md
+#
+
+#
+# Run as: ruby ch-1.rb
+#
+
+
+start_years = [1600, 2000]
+long_year_offsets = [
+ 4, 9, 15, 20, 26,
+ 32, 37, 43, 48, 54,
+ 60, 65, 71, 76, 82,
+ 88, 93, 99,
+ 105, 111, 116, 122,
+ 128, 133, 139, 144, 150,
+ 156, 161, 167, 172, 178,
+ 184, 189, 195,
+ 201, 207, 212, 218,
+ 224, 229, 235, 240, 246,
+ 252, 257, 263, 268, 274,
+ 280, 285, 291, 296,
+ 303, 308, 314,
+ 320, 325, 331, 336, 342,
+ 348, 353, 359, 364, 370,
+ 376, 381, 387, 392, 398
+]
+
+start_years . each do
+ | start_year |
+ long_year_offsets . each do
+ | offset |
+ year = start_year + offset
+ if 1900 <= year and year <= 2100 then
+ puts (year)
+ end
+ end
+end