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+-- Hello world program
+use std.textio.all; -- Imports the standard textio package.
+
+-- Defines a design entity, without any ports.
+entity hello_world is
+end hello_world;
+
+architecture behaviour of hello_world is
+begin
+ process
+ variable l : line;
+ begin
+ write (l, String'("Hello world!"));
+ writeline (output, l);
+ wait;
+ end process;
+end behaviour;