diff --git a/Pipfile b/Pipfile
index 53fbc0b..4cd8482 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 971d86f..6b621ee 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "3cd384133d721bd48a016ab49f8cb227aba81d2b1aff9b9921edc7b18c7f752b"
+            "sha256": "c0d1694c1b30c58074c742f24b701101130829b23fe5e555f54715a92f6a73cc"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -16,34 +16,36 @@
         ]
     },
     "default": {
-        "appnope": {
-            "hashes": [
-                "sha256:5b26757dc6f79a3b7dc9fab95359328d5747fcb2409d331ea66d0272b90ab2a0",
-                "sha256:8b995ffe925347a2138d7ac0fe77155e4311a0ea6d6da4f5128fe4b3cbe5ed71"
-            ],
-            "markers": "platform_system == 'Darwin'",
-            "version": "==0.1.0"
-        },
         "backcall": {
             "hashes": [
-                "sha256:38ecd85be2c1e78f77fd91700c76e14667dc21e2713b63876c0eb901196e01e4",
-                "sha256:bbbf4b1e5cd2bdb08f915895b51081c041bac22394fdfcfdfbe9f14b77c08bf2"
+                "sha256:5cbdbf27be5e7cfadb448baf0aa95508f91f2bbc6c6437cd9cd06e2a4c215e1e",
+                "sha256:fbbce6a29f263178a1f7915c1940bde0ec2b2a967566fe1c65c1dfb7422bd255"
             ],
-            "version": "==0.1.0"
+            "version": "==0.2.0"
         },
         "cycler": {
             "hashes": [
-                "sha256:1d8a5ae1ff6c5cf9b93e8811e581232ad8920aeec647c37316ceac982b08cb2d",
-                "sha256:cd7b2d1018258d7247a71425e9f26463dfb444d411c39569972f4ce586b0c9d8"
+                "sha256:3a27e95f763a428a739d2add979fa7494c912a32c17c4c38c4d5f082cad165a3",
+                "sha256:9c87405839a19696e837b3b818fed3f5f69f16f1eec1a1ad77e043dcea9c772f"
             ],
-            "version": "==0.10.0"
+            "markers": "python_version >= '3.6'",
+            "version": "==0.11.0"
         },
         "decorator": {
             "hashes": [
-                "sha256:41fa54c2a0cc4ba648be4fd43cff00aedf5b9465c9bf18d64325bc225f08f760",
-                "sha256:e3a62f0520172440ca0dcc823749319382e377f37f140a0b99ef45fecb84bfe7"
+                "sha256:637996211036b6385ef91435e4fae22989472f9d571faba8927ba8253acbc330",
+                "sha256:b8c3f85900b9dc423225913c5aace94729fe1fa9763b38939a95226f02d37186"
+            ],
+            "markers": "python_version >= '3.5'",
+            "version": "==5.1.1"
+        },
+        "entrypoints": {
+            "hashes": [
+                "sha256:589f874b313739ad35be6e0cd7efde2a4e9b6fea91edcc34e58ecbb8dbe56d19",
+                "sha256:c70dd71abe5a8c85e55e12c19bd91ccfeec11a6e99044204511f9ed547d48451"
             ],
-            "version": "==4.4.2"
+            "markers": "python_version >= '2.7'",
+            "version": "==0.3"
         },
         "ipykernel": {
             "hashes": [
@@ -55,67 +57,93 @@
         },
         "ipython": {
             "hashes": [
-                "sha256:d9459e7237e2e5858738ff9c3e26504b79899b58a6d49e574d352493d80684c6",
-                "sha256:f6689108b1734501d3b59c84427259fd5ac5141afe2e846cfa8598eb811886c9"
+                "sha256:5ac47dc9af66fc2f5530c12069390877ae372ac905edca75a92a6e363b5d7caa",
+                "sha256:c0427ed8bc33ac481faf9d3acf7e84e0010cdaada945e0badd1e2e74cc075833"
             ],
             "index": "pypi",
-            "version": "==7.12.0"
-        },
-        "ipython-genutils": {
-            "hashes": [
-                "sha256:72dd37233799e619666c9f639a9da83c34013a73e8bbc79a7a6348d93c61fab8",
-                "sha256:eb2e116e75ecef9d4d228fdc66af54269afa26ab4463042e33785b887c628ba8"
-            ],
-            "version": "==0.2.0"
+            "version": "==7.16.3"
         },
         "jedi": {
             "hashes": [
-                "sha256:cd60c93b71944d628ccac47df9a60fec53150de53d42dc10a7fc4b5ba6aae798",
-                "sha256:df40c97641cb943661d2db4c33c2e1ff75d491189423249e989bcea4464f3030"
+                "sha256:86ed7d9b750603e4ba582ea8edc678657fb4007894a12bcf6f4bb97892f31d20",
+                "sha256:98cc583fa0f2f8304968199b01b6b4b94f469a1f4a74c1560506ca2a211378b5"
             ],
-            "version": "==0.17.0"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "version": "==0.17.2"
         },
         "joblib": {
             "hashes": [
-                "sha256:0630eea4f5664c463f23fbf5dcfc54a2bc6168902719fa8e19daf033022786c8",
-                "sha256:bdb4fd9b72915ffb49fde2229ce482dd7ae79d842ed8c2b4c932441495af1403"
+                "sha256:4158fcecd13733f8be669be0683b96ebdbbd38d23559f54dca7205aea1bf1e35",
+                "sha256:f21f109b3c7ff9d95f8387f752d0d9c34a02aa2f7060c2135f465da0e5160ff6"
             ],
-            "version": "==0.14.1"
+            "markers": "python_version >= '3.6'",
+            "version": "==1.1.0"
         },
         "jupyter-client": {
             "hashes": [
-                "sha256:3a32fa4d0b16d1c626b30c3002a62dfd86d6863ed39eaba3f537fade197bb756",
-                "sha256:cde8e83aab3ec1c614f221ae54713a9a46d3bf28292609d2db1b439bef5a8c8e"
+                "sha256:540ca35e57e83c5ece81abd9b781a57cba39a37c60a2a30c8c1b2f6663544343",
+                "sha256:f0c576cce235c727e30b0a0da88c2755d0947d0070fa1bc45f195079ffd64e66"
             ],
-            "version": "==6.1.3"
+            "markers": "python_full_version >= '3.6.1'",
+            "version": "==7.1.1"
         },
         "jupyter-core": {
             "hashes": [
-                "sha256:394fd5dd787e7c8861741880bdf8a00ce39f95de5d18e579c74b882522219e7e",
-                "sha256:a4ee613c060fe5697d913416fc9d553599c05e4492d58fac1192c9a6844abb21"
+                "sha256:1c091f3bbefd6f2a8782f2c1db662ca8478ac240e962ae2c66f0b87c818154ea",
+                "sha256:dce8a7499da5a53ae3afd5a9f4b02e5df1d57250cf48f3ad79da23b4778cd6fa"
             ],
-            "version": "==4.6.3"
+            "markers": "python_version >= '3.6'",
+            "version": "==4.9.1"
         },
         "kiwisolver": {
             "hashes": [
-                "sha256:03662cbd3e6729f341a97dd2690b271e51a67a68322affab12a5b011344b973c",
-                "sha256:18d749f3e56c0480dccd1714230da0f328e6e4accf188dd4e6884bdd06bf02dd",
-                "sha256:247800260cd38160c362d211dcaf4ed0f7816afb5efe56544748b21d6ad6d17f",
-                "sha256:443c2320520eda0a5b930b2725b26f6175ca4453c61f739fef7a5847bd262f74",
-                "sha256:4eadb361baf3069f278b055e3bb53fa189cea2fd02cb2c353b7a99ebb4477ef1",
-                "sha256:556da0a5f60f6486ec4969abbc1dd83cf9b5c2deadc8288508e55c0f5f87d29c",
-                "sha256:603162139684ee56bcd57acc74035fceed7dd8d732f38c0959c8bd157f913fec",
-                "sha256:60a78858580761fe611d22127868f3dc9f98871e6fdf0a15cc4203ed9ba6179b",
-                "sha256:7cc095a4661bdd8a5742aaf7c10ea9fac142d76ff1770a0f84394038126d8fc7",
-                "sha256:c31bc3c8e903d60a1ea31a754c72559398d91b5929fcb329b1c3a3d3f6e72113",
-                "sha256:c955791d80e464da3b471ab41eb65cf5a40c15ce9b001fdc5bbc241170de58ec",
-                "sha256:d069ef4b20b1e6b19f790d00097a5d5d2c50871b66d10075dab78938dc2ee2cf",
-                "sha256:d52b989dc23cdaa92582ceb4af8d5bcc94d74b2c3e64cd6785558ec6a879793e",
-                "sha256:e586b28354d7b6584d8973656a7954b1c69c93f708c0c07b77884f91640b7657",
-                "sha256:efcf3397ae1e3c3a4a0a0636542bcad5adad3b1dd3e8e629d0b6e201347176c8",
-                "sha256:fccefc0d36a38c57b7bd233a9b485e2f1eb71903ca7ad7adacad6c28a56d62d2"
-            ],
-            "version": "==1.2.0"
+                "sha256:0007840186bacfaa0aba4466d5890334ea5938e0bb7e28078a0eb0e63b5b59d5",
+                "sha256:19554bd8d54cf41139f376753af1a644b63c9ca93f8f72009d50a2080f870f77",
+                "sha256:1d45d1c74f88b9f41062716c727f78f2a59a5476ecbe74956fafb423c5c87a76",
+                "sha256:1d819553730d3c2724582124aee8a03c846ec4362ded1034c16fb3ef309264e6",
+                "sha256:2210f28778c7d2ee13f3c2a20a3a22db889e75f4ec13a21072eabb5693801e84",
+                "sha256:22521219ca739654a296eea6d4367703558fba16f98688bd8ce65abff36eaa84",
+                "sha256:25405f88a37c5f5bcba01c6e350086d65e7465fd1caaf986333d2a045045a223",
+                "sha256:2b65bd35f3e06a47b5c30ea99e0c2b88f72c6476eedaf8cfbc8e66adb5479dcf",
+                "sha256:2ddb500a2808c100e72c075cbb00bf32e62763c82b6a882d403f01a119e3f402",
+                "sha256:2f8f6c8f4f1cff93ca5058d6ec5f0efda922ecb3f4c5fb76181f327decff98b8",
+                "sha256:30fa008c172355c7768159983a7270cb23838c4d7db73d6c0f6b60dde0d432c6",
+                "sha256:3dbb3cea20b4af4f49f84cffaf45dd5f88e8594d18568e0225e6ad9dec0e7967",
+                "sha256:4116ba9a58109ed5e4cb315bdcbff9838f3159d099ba5259c7c7fb77f8537492",
+                "sha256:44e6adf67577dbdfa2d9f06db9fbc5639afefdb5bf2b4dfec25c3a7fbc619536",
+                "sha256:5326ddfacbe51abf9469fe668944bc2e399181a2158cb5d45e1d40856b2a0589",
+                "sha256:70adc3658138bc77a36ce769f5f183169bc0a2906a4f61f09673f7181255ac9b",
+                "sha256:72be6ebb4e92520b9726d7146bc9c9b277513a57a38efcf66db0620aec0097e0",
+                "sha256:7843b1624d6ccca403a610d1277f7c28ad184c5aa88a1750c1a999754e65b439",
+                "sha256:7ba5a1041480c6e0a8b11a9544d53562abc2d19220bfa14133e0cdd9967e97af",
+                "sha256:80efd202108c3a4150e042b269f7c78643420cc232a0a771743bb96b742f838f",
+                "sha256:82f49c5a79d3839bc8f38cb5f4bfc87e15f04cbafa5fbd12fb32c941cb529cfb",
+                "sha256:83d2c9db5dfc537d0171e32de160461230eb14663299b7e6d18ca6dca21e4977",
+                "sha256:8d93a1095f83e908fc253f2fb569c2711414c0bfd451cab580466465b235b470",
+                "sha256:8dc3d842fa41a33fe83d9f5c66c0cc1f28756530cd89944b63b072281e852031",
+                "sha256:9661a04ca3c950a8ac8c47f53cbc0b530bce1b52f516a1e87b7736fec24bfff0",
+                "sha256:a498bcd005e8a3fedd0022bb30ee0ad92728154a8798b703f394484452550507",
+                "sha256:a7a4cf5bbdc861987a7745aed7a536c6405256853c94abc9f3287c3fa401b174",
+                "sha256:b5074fb09429f2b7bc82b6fb4be8645dcbac14e592128beeff5461dcde0af09f",
+                "sha256:b6a5431940f28b6de123de42f0eb47b84a073ee3c3345dc109ad550a3307dd28",
+                "sha256:ba677bcaff9429fd1bf01648ad0901cea56c0d068df383d5f5856d88221fe75b",
+                "sha256:bcadb05c3d4794eb9eee1dddf1c24215c92fb7b55a80beae7a60530a91060560",
+                "sha256:bf7eb45d14fc036514c09554bf983f2a72323254912ed0c3c8e697b62c4c158f",
+                "sha256:c358721aebd40c243894298f685a19eb0491a5c3e0b923b9f887ef1193ddf829",
+                "sha256:c4550a359c5157aaf8507e6820d98682872b9100ce7607f8aa070b4b8af6c298",
+                "sha256:c6572c2dab23c86a14e82c245473d45b4c515314f1f859e92608dcafbd2f19b8",
+                "sha256:cba430db673c29376135e695c6e2501c44c256a81495da849e85d1793ee975ad",
+                "sha256:dedc71c8eb9c5096037766390172c34fb86ef048b8e8958b4e484b9e505d66bc",
+                "sha256:e6f5eb2f53fac7d408a45fbcdeda7224b1cfff64919d0f95473420a931347ae9",
+                "sha256:ec2eba188c1906b05b9b49ae55aae4efd8150c61ba450e6721f64620c50b59eb",
+                "sha256:ee040a7de8d295dbd261ef2d6d3192f13e2b08ec4a954de34a6fb8ff6422e24c",
+                "sha256:eedd3b59190885d1ebdf6c5e0ca56828beb1949b4dfe6e5d0256a461429ac386",
+                "sha256:f441422bb313ab25de7b3dbfd388e790eceb76ce01a18199ec4944b369017009",
+                "sha256:f8eb7b6716f5b50e9c06207a14172cf2de201e41912ebe732846c02c830455b9",
+                "sha256:fc4453705b81d03568d5b808ad8f09c77c47534f6ac2e72e733f9ca4714aa75c"
+            ],
+            "markers": "python_version >= '3.7'",
+            "version": "==1.3.2"
         },
         "matplotlib": {
             "hashes": [
@@ -139,9 +167,18 @@
         },
         "mpmath": {
             "hashes": [
-                "sha256:fc17abe05fbab3382b61a123c398508183406fa132e0223874578e20946499f6"
+                "sha256:604bc21bd22d2322a177c73bdb573994ef76e62edd595d17e00aff24b0667e5c",
+                "sha256:79ffb45cf9f4b101a807595bcb3e72e0396202e0b1d25d689134b48c4216a81a"
             ],
-            "version": "==1.1.0"
+            "version": "==1.2.1"
+        },
+        "nest-asyncio": {
+            "hashes": [
+                "sha256:3fdd0d6061a2bb16f21fe8a9c6a7945be83521d81a0d15cff52e9edee50101d6",
+                "sha256:f969f6013a16fadb4adcf09d11a68a4f617c6049d7af7ac2c676110169a63abd"
+            ],
+            "markers": "python_version >= '3.5'",
+            "version": "==1.5.4"
         },
         "networkx": {
             "hashes": [
@@ -202,17 +239,18 @@
         },
         "parso": {
             "hashes": [
-                "sha256:158c140fc04112dc45bca311633ae5033c2c2a7b732fa33d0955bad8152a8dd0",
-                "sha256:908e9fae2144a076d72ae4e25539143d40b8e3eafbaeae03c1bfe226f4cdf12c"
+                "sha256:97218d9159b2520ff45eb78028ba8b50d2bc61dcc062a9682666f2dc4bd331ea",
+                "sha256:caba44724b994a8a5e086460bb212abc5a8bc46951bf4a9a1210745953622eb9"
             ],
-            "version": "==0.7.0"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==0.7.1"
         },
         "patsy": {
             "hashes": [
-                "sha256:5465be1c0e670c3a965355ec09e9a502bf2c4cbe4875e8528b0221190a8a5d40",
-                "sha256:f115cec4201e1465cd58b9866b0b0e7b941caafec129869057405bfe5b5e3991"
+                "sha256:5053de7804676aba62783dbb0f23a2b3d74e35e5bfa238b88b7cbf148a38b69d",
+                "sha256:cc80955ae8c13a7e7c4051eda7b277c8f909f50bc7d73e124bc38e2ee3d95041"
             ],
-            "version": "==0.5.1"
+            "version": "==0.5.2"
         },
         "pexpect": {
             "hashes": [
@@ -231,78 +269,102 @@
         },
         "prompt-toolkit": {
             "hashes": [
-                "sha256:563d1a4140b63ff9dd587bda9557cffb2fe73650205ab6f4383092fb882e7dc8",
-                "sha256:df7e9e63aea609b1da3a65641ceaf5bc7d05e0a04de5bd45d05dbeffbabf9e04"
+                "sha256:1bb05628c7d87b645974a1bad3f17612be0c29fa39af9f7688030163f680bad6",
+                "sha256:e56f2ff799bacecd3e88165b1e2f5ebf9bcd59e80e06d395fa0cc4b8bd7bb506"
             ],
-            "version": "==3.0.5"
+            "markers": "python_full_version >= '3.6.2'",
+            "version": "==3.0.24"
         },
         "ptyprocess": {
             "hashes": [
-                "sha256:923f299cc5ad920c68f2bc0bc98b75b9f838b93b599941a6b63ddbc2476394c0",
-                "sha256:d7cc528d76e76342423ca640335bd3633420dc1366f258cb31d05e865ef5ca1f"
+                "sha256:4b41f3967fce3af57cc7e94b888626c18bf37a083e3651ca8feeb66d492fef35",
+                "sha256:5c5d0a3b48ceee0b48485e0c26037c0acd7d29765ca3fbb5cb3831d347423220"
             ],
-            "version": "==0.6.0"
+            "version": "==0.7.0"
         },
         "pygments": {
             "hashes": [
-                "sha256:647344a061c249a3b74e230c739f434d7ea4d8b1d5f3721bc0f3558049b38f44",
-                "sha256:ff7a40b4860b727ab48fad6360eb351cc1b33cbf9b15a0f689ca5353e9463324"
+                "sha256:44238f1b60a76d78fc8ca0528ee429702aae011c265fe6a8dd8b63049ae41c65",
+                "sha256:4e426f72023d88d03b2fa258de560726ce890ff3b630f88c21cbb8b2503b8c6a"
             ],
-            "version": "==2.6.1"
+            "markers": "python_version >= '3.5'",
+            "version": "==2.11.2"
         },
         "pyparsing": {
             "hashes": [
-                "sha256:c203ec8783bf771a155b207279b9bccb8dea02d8f0c9e5f8ead507bc3246ecc1",
-                "sha256:ef9d7589ef3c200abe66653d3f1ab1033c3c419ae9b9bdb1240a85b024efc88b"
+                "sha256:18ee9022775d270c55187733956460083db60b37d0d0fb357445f3094eed3eea",
+                "sha256:a6c06a88f252e6c322f65faf8f418b16213b51bdfaece0524c1c1bc30c63c484"
             ],
-            "version": "==2.4.7"
+            "markers": "python_version >= '3.6'",
+            "version": "==3.0.7"
         },
         "python-dateutil": {
             "hashes": [
-                "sha256:73ebfe9dbf22e832286dafa60473e4cd239f8592f699aa5adaf10050e6e1823c",
-                "sha256:75bb3f31ea686f1197762692a9ee6a7550b59fc6ca3a1f4b5d7e32fb98e2da2a"
+                "sha256:0123cacc1627ae19ddf3c27a5de5bd67ee4586fbdd6440d9748f8abb483d3e86",
+                "sha256:961d03dc3453ebbc59dbdea9e4e11c5651520a876d0f4db161e8674aae935da9"
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-            "version": "==2.8.1"
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@@ -366,12 +428,21 @@
             "index": "pypi",
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+        "setuptools": {
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@@ -410,31 +481,65 @@
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