diff --git a/Pipfile b/Pipfile
index 55fc8e5..d1d040b 100644
--- a/Pipfile
+++ b/Pipfile
@@ -10,7 +10,7 @@ numpy = "~=1.18.3"
 scipy = "~=1.4.1"
 sympy = "~=1.5.1"
 matplotlib = "~=3.2.1"
-ipython = "~=7.12.0"
+ipython = "~=7.16.3"
 pandas = "~=1.0.3"
 ipykernel = "~=5.2.1"
 seaborn = "~=0.10.0"
diff --git a/Pipfile.lock b/Pipfile.lock
index 5382b33..717a274 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "9ffcdc5e44f1c51e29043e2d0f5ec15abd1b0d4a03454a14dc14c55fb21d0f6f"
+            "sha256": "debbcd654ef28712c06bddd4bad76d2ca9ff9ea7991fa8b68149e01d81c0d99a"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -16,38 +16,48 @@
         ]
     },
     "default": {
-        "appnope": {
-            "hashes": [
-                "sha256:93aa393e9d6c54c5cd570ccadd8edad61ea0c4b9ea7a01409020c9aa019eb442",
-                "sha256:dd83cd4b5b460958838f6eb3000c660b1f9caf2a5b1de4264e941512f603258a"
-            ],
-            "markers": "sys_platform == 'darwin' and platform_system == 'Darwin'",
-            "version": "==0.1.2"
-        },
         "argon2-cffi": {
             "hashes": [
-                "sha256:165cadae5ac1e26644f5ade3bd9c18d89963be51d9ea8817bd671006d7909057",
-                "sha256:217b4f0f853ccbbb5045242946ad2e162e396064575860141b71a85eb47e475a",
-                "sha256:245f64a203012b144b7b8c8ea6d468cb02b37caa5afee5ba4a10c80599334f6a",
-                "sha256:4ad152c418f7eb640eac41ac815534e6aa61d1624530b8e7779114ecfbf327f8",
-                "sha256:566ffb581bbd9db5562327aee71b2eda24a1c15b23a356740abe3c011bbe0dcb",
-                "sha256:65213a9174320a1aee03fe826596e0620783966b49eb636955958b3074e87ff9",
-                "sha256:bc513db2283c385ea4da31a2cd039c33380701f376f4edd12fe56db118a3b21a",
-                "sha256:c7a7c8cc98ac418002090e4add5bebfff1b915ea1cb459c578cd8206fef10378",
-                "sha256:e4d8f0ae1524b7b0372a3e574a2561cbdddb3fdb6c28b70a72868189bda19659",
-                "sha256:f710b61103d1a1f692ca3ecbd1373e28aa5e545ac625ba067ff2feca1b2bb870",
-                "sha256:fa7e7d1fc22514a32b1761fdfa1882b6baa5c36bb3ef557bdd69e6fc9ba14a41"
+                "sha256:8c976986f2c5c0e5000919e6de187906cfd81fb1c72bf9d88c01177e77da7f80",
+                "sha256:d384164d944190a7dd7ef22c6aa3ff197da12962bd04b17f64d4e93d934dba5b"
             ],
-            "markers": "python_version >= '3.5'",
-            "version": "==21.1.0"
+            "markers": "python_version >= '3.6'",
+            "version": "==21.3.0"
+        },
+        "argon2-cffi-bindings": {
+            "hashes": [
+                "sha256:20ef543a89dee4db46a1a6e206cd015360e5a75822f76df533845c3cbaf72670",
+                "sha256:2c3e3cc67fdb7d82c4718f19b4e7a87123caf8a93fde7e23cf66ac0337d3cb3f",
+                "sha256:3b9ef65804859d335dc6b31582cad2c5166f0c3e7975f324d9ffaa34ee7e6583",
+                "sha256:3e385d1c39c520c08b53d63300c3ecc28622f076f4c2b0e6d7e796e9f6502194",
+                "sha256:58ed19212051f49a523abb1dbe954337dc82d947fb6e5a0da60f7c8471a8476c",
+                "sha256:5e00316dabdaea0b2dd82d141cc66889ced0cdcbfa599e8b471cf22c620c329a",
+                "sha256:603ca0aba86b1349b147cab91ae970c63118a0f30444d4bc80355937c950c082",
+                "sha256:6a22ad9800121b71099d0fb0a65323810a15f2e292f2ba450810a7316e128ee5",
+                "sha256:8cd69c07dd875537a824deec19f978e0f2078fdda07fd5c42ac29668dda5f40f",
+                "sha256:93f9bf70084f97245ba10ee36575f0c3f1e7d7724d67d8e5b08e61787c320ed7",
+                "sha256:9524464572e12979364b7d600abf96181d3541da11e23ddf565a32e70bd4dc0d",
+                "sha256:b2ef1c30440dbbcba7a5dc3e319408b59676e2e039e2ae11a8775ecf482b192f",
+                "sha256:b746dba803a79238e925d9046a63aa26bf86ab2a2fe74ce6b009a1c3f5c8f2ae",
+                "sha256:bb89ceffa6c791807d1305ceb77dbfacc5aa499891d2c55661c6459651fc39e3",
+                "sha256:bd46088725ef7f58b5a1ef7ca06647ebaf0eb4baff7d1d0d177c6cc8744abd86",
+                "sha256:ccb949252cb2ab3a08c02024acb77cfb179492d5701c7cbdbfd776124d4d2367",
+                "sha256:d4966ef5848d820776f5f562a7d45fdd70c2f330c961d0d745b784034bd9f48d",
+                "sha256:e415e3f62c8d124ee16018e491a009937f8cf7ebf5eb430ffc5de21b900dad93",
+                "sha256:ed2937d286e2ad0cc79a7087d3c272832865f779430e0cc2b4f3718d3159b0cb",
+                "sha256:f1152ac548bd5b8bcecfb0b0371f082037e47128653df2e8ba6e914d384f3c3e",
+                "sha256:f9f8b450ed0547e3d473fdc8612083fd08dd2120d6ac8f73828df9b7d45bb351"
+            ],
+            "markers": "python_version >= '3.6'",
+            "version": "==21.2.0"
         },
         "attrs": {
             "hashes": [
-                "sha256:149e90d6d8ac20db7a955ad60cf0e6881a3f20d37096140088356da6c716b0b1",
-                "sha256:ef6aaac3ca6cd92904cdd0d83f629a15f18053ec84e6432106f7a4d04ae4f5fb"
+                "sha256:2d27e3784d7a565d36ab851fe94887c5eccd6a463168875832a1be79c82828b4",
+                "sha256:626ba8234211db98e869df76230a137c4c40a12d72445c45d5f5b716f076e2fd"
             ],
             "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
-            "version": "==21.2.0"
+            "version": "==21.4.0"
         },
         "backcall": {
             "hashes": [
@@ -152,11 +162,11 @@
         },
         "importlib-metadata": {
             "hashes": [
-                "sha256:53ccfd5c134223e497627b9815d5030edf77d2ed573922f7a0b8f8bb81a1c100",
-                "sha256:75bdec14c397f528724c1bfd9709d660b33a4d2e77387a3358f20b848bb5e5fb"
+                "sha256:899e2a40a8c4a1aec681feef45733de8a6c58f3f6a0dbed2eb6574b4387a77b6",
+                "sha256:951f0d8a5b7260e9db5e41d429285b5f451e928479f19d80818878527d36e95e"
             ],
             "markers": "python_version < '3.8'",
-            "version": "==4.8.2"
+            "version": "==4.10.1"
         },
         "importlib-resources": {
             "hashes": [
@@ -176,11 +186,11 @@
         },
         "ipython": {
             "hashes": [
-                "sha256:d9459e7237e2e5858738ff9c3e26504b79899b58a6d49e574d352493d80684c6",
-                "sha256:f6689108b1734501d3b59c84427259fd5ac5141afe2e846cfa8598eb811886c9"
+                "sha256:5ac47dc9af66fc2f5530c12069390877ae372ac905edca75a92a6e363b5d7caa",
+                "sha256:c0427ed8bc33ac481faf9d3acf7e84e0010cdaada945e0badd1e2e74cc075833"
             ],
             "index": "pypi",
-            "version": "==7.12.0"
+            "version": "==7.16.3"
         },
         "ipython-genutils": {
             "hashes": [
@@ -199,11 +209,11 @@
         },
         "jedi": {
             "hashes": [
-                "sha256:637c9635fcf47945ceb91cd7f320234a7be540ded6f3e99a50cb6febdfd1ba8d",
-                "sha256:74137626a64a99c8eb6ae5832d99b3bdd7d29a3850fe2aa80a4126b2a7d949ab"
+                "sha256:86ed7d9b750603e4ba582ea8edc678657fb4007894a12bcf6f4bb97892f31d20",
+                "sha256:98cc583fa0f2f8304968199b01b6b4b94f469a1f4a74c1560506ca2a211378b5"
             ],
-            "markers": "python_version >= '3.6'",
-            "version": "==0.18.1"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "version": "==0.17.2"
         },
         "jinja2": {
             "hashes": [
@@ -223,19 +233,19 @@
         },
         "jsonschema": {
             "hashes": [
-                "sha256:2a0f162822a64d95287990481b45d82f096e99721c86534f48201b64ebca6e8c",
-                "sha256:390713469ae64b8a58698bb3cbc3859abe6925b565a973f87323ef21b09a27a8"
+                "sha256:636694eb41b3535ed608fe04129f26542b59ed99808b4f688aa32dcf55317a83",
+                "sha256:77281a1f71684953ee8b3d488371b162419767973789272434bbc3f29d9c8823"
             ],
             "markers": "python_version >= '3.7'",
-            "version": "==4.2.1"
+            "version": "==4.4.0"
         },
         "jupyter-client": {
             "hashes": [
-                "sha256:64d93752d8cbfba0c1030c3335c3f0d9797cd1efac012652a14aac1653db11a3",
-                "sha256:a5f995a73cffb314ed262713ae6dfce53c6b8216cea9f332071b8ff44a6e1654"
+                "sha256:540ca35e57e83c5ece81abd9b781a57cba39a37c60a2a30c8c1b2f6663544343",
+                "sha256:f0c576cce235c727e30b0a0da88c2755d0947d0070fa1bc45f195079ffd64e66"
             ],
             "markers": "python_full_version >= '3.6.1'",
-            "version": "==7.1.0"
+            "version": "==7.1.1"
         },
         "jupyter-core": {
             "hashes": [
@@ -415,19 +425,19 @@
         },
         "nbclient": {
             "hashes": [
-                "sha256:8a307be4129cce5f70eb83a57c3edbe45656623c31de54e38bb6fdfbadc428b3",
-                "sha256:99e46ddafacd0b861293bf246fed8540a184adfa3aa7d641f89031ec070701e0"
+                "sha256:5b582e21c8b464e6676a9d60acc6871d7fbc3b080f74bef265a9f90411b31f6f",
+                "sha256:b5fdea88d6fa52ca38de6c2361401cfe7aaa7cd24c74effc5e489cec04d79088"
             ],
-            "markers": "python_full_version >= '3.6.1'",
-            "version": "==0.5.9"
+            "markers": "python_version >= '3.7'",
+            "version": "==0.5.10"
         },
         "nbconvert": {
             "hashes": [
-                "sha256:5e77d6203854944520105e38f2563a813a4a3708e8563aa598928a3b5ee1081a",
-                "sha256:8f23fbeabda4a500685d788ee091bf22cf34119304314304fb39f16e2fc32f37"
+                "sha256:5412ec774c6db4fccecb8c4ba07ec5d37d6dcf5762593cb3d6ecbbeb562ebbe5",
+                "sha256:f5ec6a1fad9e3aa2bee7c6a1c4ad3e0fafaa7ff64f29ba56d9da7e1669f8521c"
             ],
             "markers": "python_version >= '3.7'",
-            "version": "==6.3.0"
+            "version": "==6.4.0"
         },
         "nbformat": {
             "hashes": [
@@ -439,11 +449,11 @@
         },
         "nest-asyncio": {
             "hashes": [
-                "sha256:76d6e972265063fe92a90b9cc4fb82616e07d586b346ed9d2c89a4187acea39c",
-                "sha256:afc5a1c515210a23c461932765691ad39e8eba6551c055ac8d5546e69250d0aa"
+                "sha256:3fdd0d6061a2bb16f21fe8a9c6a7945be83521d81a0d15cff52e9edee50101d6",
+                "sha256:f969f6013a16fadb4adcf09d11a68a4f617c6049d7af7ac2c676110169a63abd"
             ],
             "markers": "python_version >= '3.5'",
-            "version": "==1.5.1"
+            "version": "==1.5.4"
         },
         "networkx": {
             "hashes": [
@@ -455,11 +465,11 @@
         },
         "notebook": {
             "hashes": [
-                "sha256:5cad068fa82cd4fb98d341c052100ed50cd69fbfb4118cb9b8ab5a346ef27551",
-                "sha256:7bcdf79bd1cda534735bd9830d2cbedab4ee34d8fe1df6e7b946b3aab0902ba3"
+                "sha256:968e9c09639fe4b9dbf4b9f028daf861b563c124d735a99d6d48c09317553f31",
+                "sha256:b01da66f11a203b3839d6afa4013674bcfff41c36552f9ad0fbcb2d93c92764a"
             ],
             "markers": "python_version >= '3.6'",
-            "version": "==6.4.6"
+            "version": "==6.4.7"
         },
         "numpy": {
             "hashes": [
@@ -528,11 +538,11 @@
         },
         "parso": {
             "hashes": [
-                "sha256:12b83492c6239ce32ff5eed6d3639d6a536170723c6f3f1506869f1ace413398",
-                "sha256:a8c4922db71e4fdb90e0d0bc6e50f9b273d3397925e5e60a717e719201778d22"
+                "sha256:97218d9159b2520ff45eb78028ba8b50d2bc61dcc062a9682666f2dc4bd331ea",
+                "sha256:caba44724b994a8a5e086460bb212abc5a8bc46951bf4a9a1210745953622eb9"
             ],
-            "markers": "python_version >= '3.6'",
-            "version": "==0.8.2"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==0.7.1"
         },
         "patsy": {
             "hashes": [
@@ -566,11 +576,11 @@
         },
         "prompt-toolkit": {
             "hashes": [
-                "sha256:5f29d62cb7a0ecacfa3d8ceea05a63cd22500543472d64298fc06ddda906b25d",
-                "sha256:7053aba00895473cb357819358ef33f11aa97e4ac83d38efb123e5649ceeecaf"
+                "sha256:1bb05628c7d87b645974a1bad3f17612be0c29fa39af9f7688030163f680bad6",
+                "sha256:e56f2ff799bacecd3e88165b1e2f5ebf9bcd59e80e06d395fa0cc4b8bd7bb506"
             ],
             "markers": "python_full_version >= '3.6.2'",
-            "version": "==3.0.23"
+            "version": "==3.0.24"
         },
         "ptyprocess": {
             "hashes": [
@@ -590,46 +600,46 @@
         },
         "pygments": {
             "hashes": [
-                "sha256:b8e67fe6af78f492b3c4b3e2970c0624cbf08beb1e493b2c99b9fa1b67a20380",
-                "sha256:f398865f7eb6874156579fdf36bc840a03cab64d1cde9e93d68f46a425ec52c6"
+                "sha256:44238f1b60a76d78fc8ca0528ee429702aae011c265fe6a8dd8b63049ae41c65",
+                "sha256:4e426f72023d88d03b2fa258de560726ce890ff3b630f88c21cbb8b2503b8c6a"
             ],
             "markers": "python_version >= '3.5'",
-            "version": "==2.10.0"
+            "version": "==2.11.2"
         },
         "pyparsing": {
             "hashes": [
-                "sha256:04ff808a5b90911829c55c4e26f75fa5ca8a2f5f36aa3a51f68e27033341d3e4",
-                "sha256:d9bdec0013ef1eb5a84ab39a3b3868911598afa494f5faa038647101504e2b81"
+                "sha256:18ee9022775d270c55187733956460083db60b37d0d0fb357445f3094eed3eea",
+                "sha256:a6c06a88f252e6c322f65faf8f418b16213b51bdfaece0524c1c1bc30c63c484"
             ],
             "markers": "python_version >= '3.6'",
-            "version": "==3.0.6"
+            "version": "==3.0.7"
         },
         "pyrsistent": {
             "hashes": [
-                "sha256:097b96f129dd36a8c9e33594e7ebb151b1515eb52cceb08474c10a5479e799f2",
-                "sha256:2aaf19dc8ce517a8653746d98e962ef480ff34b6bc563fc067be6401ffb457c7",
-                "sha256:404e1f1d254d314d55adb8d87f4f465c8693d6f902f67eb6ef5b4526dc58e6ea",
-                "sha256:48578680353f41dca1ca3dc48629fb77dfc745128b56fc01096b2530c13fd426",
-                "sha256:4916c10896721e472ee12c95cdc2891ce5890898d2f9907b1b4ae0f53588b710",
-                "sha256:527be2bfa8dc80f6f8ddd65242ba476a6c4fb4e3aedbf281dfbac1b1ed4165b1",
-                "sha256:58a70d93fb79dc585b21f9d72487b929a6fe58da0754fa4cb9f279bb92369396",
-                "sha256:5e4395bbf841693eaebaa5bb5c8f5cdbb1d139e07c975c682ec4e4f8126e03d2",
-                "sha256:6b5eed00e597b5b5773b4ca30bd48a5774ef1e96f2a45d105db5b4ebb4bca680",
-                "sha256:73ff61b1411e3fb0ba144b8f08d6749749775fe89688093e1efef9839d2dcc35",
-                "sha256:772e94c2c6864f2cd2ffbe58bb3bdefbe2a32afa0acb1a77e472aac831f83427",
-                "sha256:773c781216f8c2900b42a7b638d5b517bb134ae1acbebe4d1e8f1f41ea60eb4b",
-                "sha256:a0c772d791c38bbc77be659af29bb14c38ced151433592e326361610250c605b",
-                "sha256:b29b869cf58412ca5738d23691e96d8aff535e17390128a1a52717c9a109da4f",
-                "sha256:c1a9ff320fa699337e05edcaae79ef8c2880b52720bc031b219e5b5008ebbdef",
-                "sha256:cd3caef37a415fd0dae6148a1b6957a8c5f275a62cca02e18474608cb263640c",
-                "sha256:d5ec194c9c573aafaceebf05fc400656722793dac57f254cd4741f3c27ae57b4",
-                "sha256:da6e5e818d18459fa46fac0a4a4e543507fe1110e808101277c5a2b5bab0cd2d",
-                "sha256:e79d94ca58fcafef6395f6352383fa1a76922268fa02caa2272fff501c2fdc78",
-                "sha256:f3ef98d7b76da5eb19c37fda834d50262ff9167c65658d1d8f974d2e4d90676b",
-                "sha256:f4c8cabb46ff8e5d61f56a037974228e978f26bfefce4f61a4b1ac0ba7a2ab72"
+                "sha256:0e3e1fcc45199df76053026a51cc59ab2ea3fc7c094c6627e93b7b44cdae2c8c",
+                "sha256:1b34eedd6812bf4d33814fca1b66005805d3640ce53140ab8bbb1e2651b0d9bc",
+                "sha256:4ed6784ceac462a7d6fcb7e9b663e93b9a6fb373b7f43594f9ff68875788e01e",
+                "sha256:5d45866ececf4a5fff8742c25722da6d4c9e180daa7b405dc0a2a2790d668c26",
+                "sha256:636ce2dc235046ccd3d8c56a7ad54e99d5c1cd0ef07d9ae847306c91d11b5fec",
+                "sha256:6455fc599df93d1f60e1c5c4fe471499f08d190d57eca040c0ea182301321286",
+                "sha256:6bc66318fb7ee012071b2792024564973ecc80e9522842eb4e17743604b5e045",
+                "sha256:7bfe2388663fd18bd8ce7db2c91c7400bf3e1a9e8bd7d63bf7e77d39051b85ec",
+                "sha256:7ec335fc998faa4febe75cc5268a9eac0478b3f681602c1f27befaf2a1abe1d8",
+                "sha256:914474c9f1d93080338ace89cb2acee74f4f666fb0424896fcfb8d86058bf17c",
+                "sha256:b568f35ad53a7b07ed9b1b2bae09eb15cdd671a5ba5d2c66caee40dbf91c68ca",
+                "sha256:cdfd2c361b8a8e5d9499b9082b501c452ade8bbf42aef97ea04854f4a3f43b22",
+                "sha256:d1b96547410f76078eaf66d282ddca2e4baae8964364abb4f4dcdde855cd123a",
+                "sha256:d4d61f8b993a7255ba714df3aca52700f8125289f84f704cf80916517c46eb96",
+                "sha256:d7a096646eab884bf8bed965bad63ea327e0d0c38989fc83c5ea7b8a87037bfc",
+                "sha256:df46c854f490f81210870e509818b729db4488e1f30f2a1ce1698b2295a878d1",
+                "sha256:e24a828f57e0c337c8d8bb9f6b12f09dfdf0273da25fda9e314f0b684b415a07",
+                "sha256:e4f3149fd5eb9b285d6bfb54d2e5173f6a116fe19172686797c056672689daf6",
+                "sha256:e92a52c166426efbe0d1ec1332ee9119b6d32fc1f0bbfd55d5c1088070e7fc1b",
+                "sha256:f87cc2863ef33c709e237d4b5f4502a62a00fab450c9e020892e8e2ede5847f5",
+                "sha256:fd8da6d0124efa2f67d86fa70c851022f87c98e205f0594e1fae044e7119a5a6"
             ],
-            "markers": "python_version >= '3.6'",
-            "version": "==0.18.0"
+            "markers": "python_version >= '3.7'",
+            "version": "==0.18.1"
         },
         "python-dateutil": {
             "hashes": [
@@ -768,6 +778,14 @@
             ],
             "version": "==1.8.0"
         },
+        "setuptools": {
+            "hashes": [
+                "sha256:2404879cda71495fc4d5cbc445ed52fdaddf352b36e40be8dcc63147cb4edabe",
+                "sha256:68eb94073fc486091447fcb0501efd6560a0e5a1839ba249e5ff3c4c93f05f90"
+            ],
+            "markers": "python_version >= '3.7'",
+            "version": "==60.5.0"
+        },
         "shap": {
             "hashes": [
                 "sha256:3f8d5e1bfc2f0e8b442370e4b8253430f7078fab21b7769e89969b1a0194c3f9",
@@ -901,11 +919,11 @@
         },
         "typing-extensions": {
             "hashes": [
-                "sha256:2cdf80e4e04866a9b3689a51869016d36db0814d84b8d8a568d22781d45d27ed",
-                "sha256:829704698b22e13ec9eaf959122315eabb370b0884400e9818334d8b677023d9"
+                "sha256:4ca091dea149f945ec56afb48dae714f21e8692ef22a395223bcd328961b6a0e",
+                "sha256:7f001e5ac290a0c0401508864c7ec868be4e701886d5b573a9528ed3973d9d3b"
             ],
             "markers": "python_version < '3.8'",
-            "version": "==4.0.0"
+            "version": "==4.0.1"
         },
         "wcwidth": {
             "hashes": [
@@ -930,11 +948,11 @@
         },
         "zipp": {
             "hashes": [
-                "sha256:71c644c5369f4a6e07636f0aa966270449561fcea2e3d6747b8d23efaa9d7832",
-                "sha256:9fe5ea21568a0a70e50f273397638d39b03353731e6cbbb3fd8502a33fec40bc"
+                "sha256:9f50f446828eb9d45b267433fd3e9da8d801f614129124863f9c51ebceafb87d",
+                "sha256:b47250dd24f92b7dd6a0a8fc5244da14608f3ca90a5efcd37a3b1642fac9a375"
             ],
             "markers": "python_version < '3.10'",
-            "version": "==3.6.0"
+            "version": "==3.7.0"
         }
     },
     "develop": {}