diff --git a/aoc2020/Pipfile b/aoc2020/Pipfile
new file mode 100644
index 0000000..3b066fa
--- /dev/null
+++ b/aoc2020/Pipfile
@@ -0,0 +1,12 @@
+[[source]]
+url = "https://pypi.org/simple"
+verify_ssl = true
+name = "pypi"
+
+[packages]
+
+[dev-packages]
+mypy = ""
+
+[requires]
+python_version = "3.9"
diff --git a/aoc2020/Pipfile.lock b/aoc2020/Pipfile.lock
new file mode 100644
index 0000000..d873b66
--- /dev/null
+++ b/aoc2020/Pipfile.lock
@@ -0,0 +1,92 @@
+{
+    "_meta": {
+        "hash": {
+            "sha256": "752181fd1aaa6cf905a654df10d56863fe61b74b26e95802148d225644e9bc5a"
+        },
+        "pipfile-spec": 6,
+        "requires": {
+            "python_version": "3.9"
+        },
+        "sources": [
+            {
+                "name": "pypi",
+                "url": "https://pypi.org/simple",
+                "verify_ssl": true
+            }
+        ]
+    },
+    "default": {},
+    "develop": {
+        "mypy": {
+            "hashes": [
+                "sha256:0a0d102247c16ce93c97066443d11e2d36e6cc2a32d8ccc1f705268970479324",
+                "sha256:0d34d6b122597d48a36d6c59e35341f410d4abfa771d96d04ae2c468dd201abc",
+                "sha256:2170492030f6faa537647d29945786d297e4862765f0b4ac5930ff62e300d802",
+                "sha256:2842d4fbd1b12ab422346376aad03ff5d0805b706102e475e962370f874a5122",
+                "sha256:2b21ba45ad9ef2e2eb88ce4aeadd0112d0f5026418324176fd494a6824b74975",
+                "sha256:72060bf64f290fb629bd4a67c707a66fd88ca26e413a91384b18db3876e57ed7",
+                "sha256:af4e9ff1834e565f1baa74ccf7ae2564ae38c8df2a85b057af1dbbc958eb6666",
+                "sha256:bd03b3cf666bff8d710d633d1c56ab7facbdc204d567715cb3b9f85c6e94f669",
+                "sha256:c614194e01c85bb2e551c421397e49afb2872c88b5830e3554f0519f9fb1c178",
+                "sha256:cf4e7bf7f1214826cf7333627cb2547c0db7e3078723227820d0a2490f117a01",
+                "sha256:da56dedcd7cd502ccd3c5dddc656cb36113dd793ad466e894574125945653cea",
+                "sha256:e86bdace26c5fe9cf8cb735e7cedfe7850ad92b327ac5d797c656717d2ca66de",
+                "sha256:e97e9c13d67fbe524be17e4d8025d51a7dca38f90de2e462243ab8ed8a9178d1",
+                "sha256:eea260feb1830a627fb526d22fbb426b750d9f5a47b624e8d5e7e004359b219c"
+            ],
+            "index": "pypi",
+            "markers": "python_version >= '3.5'",
+            "version": "==0.790"
+        },
+        "mypy-extensions": {
+            "hashes": [
+                "sha256:090fedd75945a69ae91ce1303b5824f428daf5a028d2f6ab8a299250a846f15d",
+                "sha256:2d82818f5bb3e369420cb3c4060a7970edba416647068eb4c5343488a6c604a8"
+            ],
+            "version": "==0.4.3"
+        },
+        "typed-ast": {
+            "hashes": [
+                "sha256:07d49388d5bf7e863f7fa2f124b1b1d89d8aa0e2f7812faff0a5658c01c59aa1",
+                "sha256:14bf1522cdee369e8f5581238edac09150c765ec1cb33615855889cf33dcb92d",
+                "sha256:240296b27397e4e37874abb1df2a608a92df85cf3e2a04d0d4d61055c8305ba6",
+                "sha256:36d829b31ab67d6fcb30e185ec996e1f72b892255a745d3a82138c97d21ed1cd",
+                "sha256:37f48d46d733d57cc70fd5f30572d11ab8ed92da6e6b28e024e4a3edfb456e37",
+                "sha256:4c790331247081ea7c632a76d5b2a265e6d325ecd3179d06e9cf8d46d90dd151",
+                "sha256:5dcfc2e264bd8a1db8b11a892bd1647154ce03eeba94b461effe68790d8b8e07",
+                "sha256:7147e2a76c75f0f64c4319886e7639e490fee87c9d25cb1d4faef1d8cf83a440",
+                "sha256:7703620125e4fb79b64aa52427ec192822e9f45d37d4b6625ab37ef403e1df70",
+                "sha256:8368f83e93c7156ccd40e49a783a6a6850ca25b556c0fa0240ed0f659d2fe496",
+                "sha256:84aa6223d71012c68d577c83f4e7db50d11d6b1399a9c779046d75e24bed74ea",
+                "sha256:85f95aa97a35bdb2f2f7d10ec5bbdac0aeb9dafdaf88e17492da0504de2e6400",
+                "sha256:8db0e856712f79c45956da0c9a40ca4246abc3485ae0d7ecc86a20f5e4c09abc",
+                "sha256:9044ef2df88d7f33692ae3f18d3be63dec69c4fb1b5a4a9ac950f9b4ba571606",
+                "sha256:963c80b583b0661918718b095e02303d8078950b26cc00b5e5ea9ababe0de1fc",
+                "sha256:987f15737aba2ab5f3928c617ccf1ce412e2e321c77ab16ca5a293e7bbffd581",
+                "sha256:9ec45db0c766f196ae629e509f059ff05fc3148f9ffd28f3cfe75d4afb485412",
+                "sha256:9fc0b3cb5d1720e7141d103cf4819aea239f7d136acf9ee4a69b047b7986175a",
+                "sha256:a2c927c49f2029291fbabd673d51a2180038f8cd5a5b2f290f78c4516be48be2",
+                "sha256:a38878a223bdd37c9709d07cd357bb79f4c760b29210e14ad0fb395294583787",
+                "sha256:b4fcdcfa302538f70929eb7b392f536a237cbe2ed9cba88e3bf5027b39f5f77f",
+                "sha256:c0c74e5579af4b977c8b932f40a5464764b2f86681327410aa028a22d2f54937",
+                "sha256:c1c876fd795b36126f773db9cbb393f19808edd2637e00fd6caba0e25f2c7b64",
+                "sha256:c9aadc4924d4b5799112837b226160428524a9a45f830e0d0f184b19e4090487",
+                "sha256:cc7b98bf58167b7f2db91a4327da24fb93368838eb84a44c472283778fc2446b",
+                "sha256:cf54cfa843f297991b7388c281cb3855d911137223c6b6d2dd82a47ae5125a41",
+                "sha256:d003156bb6a59cda9050e983441b7fa2487f7800d76bdc065566b7d728b4581a",
+                "sha256:d175297e9533d8d37437abc14e8a83cbc68af93cc9c1c59c2c292ec59a0697a3",
+                "sha256:d746a437cdbca200622385305aedd9aef68e8a645e385cc483bdc5e488f07166",
+                "sha256:e683e409e5c45d5c9082dc1daf13f6374300806240719f95dc783d1fc942af10"
+            ],
+            "version": "==1.4.2"
+        },
+        "typing-extensions": {
+            "hashes": [
+                "sha256:7cb407020f00f7bfc3cb3e7881628838e69d8f3fcab2f64742a5e76b2f841918",
+                "sha256:99d4073b617d30288f569d3f13d2bd7548c3a7e4c8de87db09a9d29bb3a4a60c",
+                "sha256:dafc7639cde7f1b6e1acc0f457842a83e722ccca8eef5270af2d74792619a89f"
+            ],
+            "version": "==3.7.4.3"
+        }
+    }
+}
diff --git a/aoc2020/day01/solution.py b/aoc2020/day01/solution.py
index 2e08da4..5503d74 100644
--- a/aoc2020/day01/solution.py
+++ b/aoc2020/day01/solution.py
@@ -14,7 +14,7 @@ def main() -> int:
 
 def _find_2020_pairs(
     inputs: typing.List[int],
-) -> typing.Generator[None, typing.Tuple[int, int], None]:
+) -> typing.Generator[typing.Tuple[int, ...], None, None]:
     found = []
 
     for i, in0 in enumerate(inputs):
@@ -30,7 +30,7 @@ def _find_2020_pairs(
 
 def _find_2020_triplets(
     inputs: typing.List[int],
-) -> typing.Generator[None, typing.Tuple[int, int], None]:
+) -> typing.Generator[typing.Tuple[int, ...], None, None]:
     found = []
 
     for i, in0 in enumerate(inputs):