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diff --git a/04_arrays.zig b/04_arrays.zig
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-//
-// Let's learn some array basics. Arrays are declared with:
-//
-//   var foo [3]u32 = [3]u32{ 42, 108, 5423 };
-//
-// When Zig can infer the size of the array, you can use '_' for the
-// size. You can also let Zig infer the type of the value so the
-// declaration is much less verbose.
-//
-//   var foo = [_]u32{ 42, 108, 5423 };
-//
-// Get values of an array using array[index] notation:
-//
-//     const bar = foo[3]; // 5423
-//
-// Set values of an array using array[index] notation:
-//
-//     foo[3] = 16;
-//
-// Get the length of an array using the len property:
-//
-//     const length = foo.len;
-//
-const std = @import("std");
-
-pub fn main() void {
-    // (Problem 1)
-    // This "const" is going to cause a problem later - can you see what it is?
-    // How do we fix it?
-    const some_primes = [_]u8{ 1, 3, 5, 7, 11, 13, 17, 19 };
-
-    // Individual values can be set with '[]' notation.
-    // Example: This line changes the first prime to 2 (which is correct):
-    some_primes[0] = 2;
-
-    // Individual values can also be accessed with '[]' notation.
-    // Example: This line stores the first prime in "first":
-    const first = some_primes[0];
-
-    // (Problem 2)
-    // Looks like we need to complete this expression. Use the example
-    // above to set "fourth" to the fourth element of the some_primes array:
-    const fourth = some_primes[???];
-
-    // (Problem 3)
-    // Use the len property to get the length of the array:
-    const length = some_primes.???;
-
-    std.debug.print("First: {}, Fourth: {}, Length: {}\n",
-        .{first, fourth, length});
-}