diff --git a/related_info/lab4/lab4-spoc-discuss/libs/hash.c b/related_info/lab4/lab4-spoc-discuss/libs/hash.c
deleted file mode 100644
index 61bcd88..0000000
--- a/related_info/lab4/lab4-spoc-discuss/libs/hash.c
+++ /dev/null
@@ -1,18 +0,0 @@
-#include <stdlib.h>
-
-/* 2^31 + 2^29 - 2^25 + 2^22 - 2^19 - 2^16 + 1 */
-#define GOLDEN_RATIO_PRIME_32       0x9e370001UL
-
-/* *
- * hash32 - generate a hash value in the range [0, 2^@bits - 1]
- * @val:    the input value
- * @bits:   the number of bits in a return value
- *
- * High bits are more random, so we use them.
- * */
-uint32_t
-hash32(uint32_t val, unsigned int bits) {
-    uint32_t hash = val * GOLDEN_RATIO_PRIME_32;
-    return (hash >> (32 - bits));
-}
-