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+//
+// Quiz time! Let's see if you can fix this whole program.
+//
+// This is meant to be challenging.
+//
+// Let the compiler tell you what's wrong.
+//
+// Start at the top.
+//
+const std = @import("std");
+
+pub fn main() void {
+    // What is this nonsense? :-)
+    const letters = "YZhifg";
+
+    const x: u8 = 1;
+
+    // This is something you haven't seen before: declaring an array
+    // without putting anything in it. There is no error here:
+    var lang: [3]u8 = undefined;
+
+    // The following lines attempt to put 'Z', 'i', and 'g' into the
+    // 'lang' array we just created.
+    lang[0] = letters[x];
+
+    x = 3;
+    lang[???] = letters[x];
+
+    x = ???;
+    lang[2] = letters[???];
+
+    // We want to "Program in Zig!" of course:
+    std.debug.print("Program in {}!\n", .{lang});
+}