diff --git a/homework/chapter2/tneg_4.c b/homework/chapter2/tneg_4.c
deleted file mode 100644
index ead1932..0000000
--- a/homework/chapter2/tneg_4.c
+++ /dev/null
@@ -1,21 +0,0 @@
-#include <assert.h>
-#include <limits.h>
-
-/*
-* Generate mask indicating rightmost 1 in x.
-* For example 0xFF00 -> 0x0100, and 0x6600 --> 0x0200.
-* If x == 0, then return 0.
-*/
-int rightmost_one(unsigned x) {
-  return x & -x;
-}
-
-int main() {
-  for (unsigned x = 0; ; x++) {
-    assert((x == 0 && rightmost_one(x) == 0) || (x != 0 && rightmost_one(x) == (1 << __builtin_ctz(x))));
-
-    if (x == UINT_MAX) {
-      break;
-    }
-  }
-}
\ No newline at end of file