diff --git a/9/a.optimized_attempt.py b/9/a.optimized_attempt.py
new file mode 100644
index 0000000..3a2a8f2
--- /dev/null
+++ b/9/a.optimized_attempt.py
@@ -0,0 +1,23 @@
+import copy
+import itertools
+
+preamble_len = 5
+
+d = [ int(x) for x in open('input').read().splitlines() ]
+
+index = preamble_len
+
+def sums(d):
+    return [ sum(x) for x in list(itertools.combinations(d, 2)) ]
+
+s = sums(d[index-preamble_len:index])
+for n in d[preamble_len:]:
+    print(d[index-preamble_len:index])
+    print(sorted(sums(d[index-preamble_len:index])))
+    new = [ (x+y) for x in d[index-preamble_len:index-1] if (y := d[index-1]) ]
+    print(new)
+    print(sorted(s))
+    print(n)
+
+    index += 1
+    s = copy.deepcopy(s)[4:]+new #4 is constant, combinations of 2 numbers
\ No newline at end of file
diff --git a/9/a.py b/9/a.py
new file mode 100644
index 0000000..1a71fdf
--- /dev/null
+++ b/9/a.py
@@ -0,0 +1,62 @@
+import copy
+import itertools
+
+preamble_len = 25
+
+d = [ int(x) for x in open('input').read().splitlines() ]
+
+def sums(d):
+    return [ sum(x) for x in list(itertools.combinations(d, 2)) ]
+
+def a(d):
+    index = preamble_len
+    for n in d[preamble_len:]:
+        if n not in sums(d[index-preamble_len:index]):
+            print(n)
+            return n
+            break
+        index += 1
+
+def b(target,d):
+    index = 0    
+    current = []
+    for i in range(len(d)):
+        # print('-')
+        # print(current)
+        j = 0
+        pop = []
+        for j_ in current:
+            # print(d[j_:i])
+            s = sum(d[j_:i])
+            if s == target:
+                l = d[j_:i]
+                print([l, min(l) + max(l)])
+            elif s > target:
+                pop.append(j)
+                # print("POP")
+                # print(current)
+            j += 1
+        [ current.pop(0) for x in pop ]
+        current.append(i)
+
+
+    #     if acc
+    #         print(l)
+    #         break
+    #     if acc > target:
+    #         acc = 0
+    #         l = []
+    # l = []
+    # acc = 0
+    # for n in d:
+    #     l.append(n)
+    #     acc += n
+    #     if acc == target and n != target:
+    #         print(l)
+    #         break
+    #     if acc > target:
+    #         acc = 0
+    #         l = []
+
+
+b(a(d),d)
\ No newline at end of file