Initial data commit

Task/Conditional-structures/Inform-7/conditional-structures-4.inf

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+[a different color every time]
+say "[one of]red[or]blue[or]green[at random].";
+
+["one" the first time it's printed, "two" the second time, then "three or more" subsequently]
+say "[one of]one[or]two[or]three or more[stopping]";
+
+[only appears once]
+say "[first time]Hello world![only]";