diff --git a/crates/starknet-os/src/hints/unimplemented.rs b/crates/starknet-os/src/hints/unimplemented.rs
index a55861d5..b131a56d 100644
--- a/crates/starknet-os/src/hints/unimplemented.rs
+++ b/crates/starknet-os/src/hints/unimplemented.rs
@@ -1,4 +1,36 @@
 use indoc::indoc;
 
 #[allow(unused)]
-pub const HINT_4: &str = indoc! {r#"exit_syscall(selector=ids.SHA256_PROCESS_BLOCK_SELECTOR)"#};
+const LOG2_CEIL: &str = indoc! {r#"
+	from starkware.python.math_utils import log2_ceil
+    ids.res = log2_ceil(ids.value)"#
+};
+
+#[allow(unused)]
+const COMPRESS: &str = indoc! {r#"
+	from starkware.starknet.core.os.data_availability.compression import compress
+    data = memory.get_range_as_ints(addr=ids.data_start, size=ids.data_end - ids.data_start)
+    segments.write_arg(ids.compressed_dst, compress(data))"#
+};
+
+#[allow(unused)]
+pub const DICTIONARY_FROM_BUCKET: &str =
+    indoc! {r#"initial_dict = {bucket_index: 0 for bucket_index in range(ids.TOTAL_N_BUCKETS)}"#};
+
+#[allow(unused)]
+const GET_PREV_OFFSET: &str = indoc! {r#"
+	dict_tracker = __dict_manager.get_tracker(ids.dict_ptr)
+    ids.prev_offset = dict_tracker.data[ids.bucket_index]"#
+};
+#[allow(unused)]
+pub const ADD_DA_SEGMENT: &str = indoc! {r#"# `use_kzg_da` is used in a hint in `process_data_availability`.
+    use_kzg_da = ids.use_kzg_da
+    if use_kzg_da or ids.compress_state_updates:
+        ids.state_updates_start = segments.add()
+    else:
+        # Assign a temporary segment, to be relocated into the output segment.
+        ids.state_updates_start = segments.add_temp_segment()"#};
+
+#[allow(unused)]
+pub const WRITE_N_UPDATES_SMALL: &str =
+    indoc! {r#"ids.is_n_updates_small = ids.n_actual_updates < ids.N_UPDATES_SMALL_PACKING_BOUND"#};