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+#!/opt/local/bin/lua
+
+--
+-- See ../README.md
+--
+
+--
+-- Run as: lua ch-2.lua < input-file
+--
+
+
+--
+-- Iterate over the input
+--
+for line in io . lines () do
+ local rows = tonumber (line)
+
+ --
+ -- Create and print row 0
+ --
+ local row = {1}
+ print "1"
+
+ local r
+ for r = 1, rows do
+ --
+ -- Create a new row
+ --
+ local new = {}
+ for i = 1, r + 1 do
+ sum = 0;
+ if i > 1
+ then sum = sum + row [i - 1]
+ io . write (" ")
+ end
+ if i <= r
+ then sum = sum + row [i]
+ end
+ --
+ -- Assign new element, and print it
+ --
+ new [i] = sum
+ io . write (sum)
+ end
+ io . write ("\n")
+ --
+ -- New row becomes current row
+ --
+ row = new
+ end
+end