diff --git a/Pipfile b/Pipfile
index dfff3cc..c04dc1f 100644
--- a/Pipfile
+++ b/Pipfile
@@ -6,7 +6,7 @@ verify_ssl = true
 [dev-packages]
 civicpy = {editable = true, path = "."}
 jupyter = "~=1.0"
-notebook = "~=5.7"
+notebook = "~=6.1"
 matplotlib = "~=2.0"
 pytest-cov = "~=2.7"
 python-coveralls = "~=2.9"
diff --git a/Pipfile.lock b/Pipfile.lock
index 617c985..568f25f 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "5b68d838a5df94d36ca15ef69d32ca561b9dcdc8304fa44774bc63b78e7fdda5"
+            "sha256": "e0fa7fb7f4c962d04c816967708ef0945d85c825d3f5f8b799393df3feb76c14"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -18,11 +18,10 @@
     "default": {
         "attrs": {
             "hashes": [
-                "sha256:08a96c641c3a74e44eb59afb61a24f2cb9f4d7188748e76ba4bb5edfa3cb7d1c",
-                "sha256:f7b7ce16570fe9965acd6d30101a28f62fb4a7f9e926b3bbc9b61f8b04247e72"
+                "sha256:31b2eced602aa8423c2aea9c76a724617ed67cf9513173fd3a4f03e3a929c7e6",
+                "sha256:832aa3cde19744e49938b91fea06d69ecb9e649c93ba974535d08ad92164f700"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
-            "version": "==19.3.0"
+            "version": "==20.3.0"
         },
         "backports-datetime-fromisoformat": {
             "hashes": [
@@ -33,10 +32,10 @@
         },
         "certifi": {
             "hashes": [
-                "sha256:5930595817496dd21bb8dc35dad090f1c2cd0adfaf21204bf6732ca5d8ee34d3",
-                "sha256:8fc0819f1f30ba15bdb34cceffb9ef04d99f420f68eb75d901e9560b8749fc41"
+                "sha256:1f422849db327d534e3d0c5f02a263458c3955ec0aae4ff09b95f195c59f4edd",
+                "sha256:f05def092c44fbf25834a51509ef6e631dc19765ab8a57b4e7ab85531f0a9cf4"
             ],
-            "version": "==2020.6.20"
+            "version": "==2020.11.8"
         },
         "chardet": {
             "hashes": [
@@ -73,23 +72,21 @@
                 "sha256:b307872f855b18632ce0c21c5e45be78c0ea7ae4c15c828c20788b26921eb3f6",
                 "sha256:b97d804b1e9b523befed77c48dacec60e6dcb0b5391d57af6a65a312a90648c0"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==2.10"
         },
         "iniconfig": {
             "hashes": [
-                "sha256:80cf40c597eb564e86346103f609d74efce0f6b4d4f30ec8ce9e2c26411ba437",
-                "sha256:e5f92f89355a67de0595932a6c6c02ab4afddc6fcdc0bfc5becd0d60884d3f69"
+                "sha256:011e24c64b7f47f6ebd835bb12a743f2fbe9a26d4cecaa7f53bc4f35ee9da8b3",
+                "sha256:bc3af051d7d14b2ee5ef9969666def0cd1a000e121eaea580d4a313df4b37f32"
             ],
-            "version": "==1.0.1"
+            "version": "==1.1.1"
         },
         "more-itertools": {
             "hashes": [
-                "sha256:68c70cc7167bdf5c7c9d8f6954a7837089c6a36bf565383919bb595efb8a17e5",
-                "sha256:b78134b2063dd214000685165d81c154522c3ee0a1c0d4d113c80361c234c5a2"
+                "sha256:8e1a2a43b2f2727425f2b5839587ae37093f19153dc26c0927d1048ff6557330",
+                "sha256:b3a9005928e5bed54076e6e549c792b306fddfe72b2d1d22dd63d42d5d3899cf"
             ],
-            "markers": "python_version >= '3.5'",
-            "version": "==8.4.0"
+            "version": "==8.6.0"
         },
         "networkx": {
             "hashes": [
@@ -101,35 +98,42 @@
         },
         "numpy": {
             "hashes": [
-                "sha256:082f8d4dd69b6b688f64f509b91d482362124986d98dc7dc5f5e9f9b9c3bb983",
-                "sha256:1bc0145999e8cb8aed9d4e65dd8b139adf1919e521177f198529687dbf613065",
-                "sha256:309cbcfaa103fc9a33ec16d2d62569d541b79f828c382556ff072442226d1968",
-                "sha256:3673c8b2b29077f1b7b3a848794f8e11f401ba0b71c49fbd26fb40b71788b132",
-                "sha256:480fdd4dbda4dd6b638d3863da3be82873bba6d32d1fc12ea1b8486ac7b8d129",
-                "sha256:56ef7f56470c24bb67fb43dae442e946a6ce172f97c69f8d067ff8550cf782ff",
-                "sha256:5a936fd51049541d86ccdeef2833cc89a18e4d3808fe58a8abeb802665c5af93",
-                "sha256:5b6885c12784a27e957294b60f97e8b5b4174c7504665333c5e94fbf41ae5d6a",
-                "sha256:667c07063940e934287993366ad5f56766bc009017b4a0fe91dbd07960d0aba7",
-                "sha256:7ed448ff4eaffeb01094959b19cbaf998ecdee9ef9932381420d514e446601cd",
-                "sha256:8343bf67c72e09cfabfab55ad4a43ce3f6bf6e6ced7acf70f45ded9ebb425055",
-                "sha256:92feb989b47f83ebef246adabc7ff3b9a59ac30601c3f6819f8913458610bdcc",
-                "sha256:935c27ae2760c21cd7354402546f6be21d3d0c806fffe967f745d5f2de5005a7",
-                "sha256:aaf42a04b472d12515debc621c31cf16c215e332242e7a9f56403d814c744624",
-                "sha256:b12e639378c741add21fbffd16ba5ad25c0a1a17cf2b6fe4288feeb65144f35b",
-                "sha256:b1cca51512299841bf69add3b75361779962f9cee7d9ee3bb446d5982e925b69",
-                "sha256:b8456987b637232602ceb4d663cb34106f7eb780e247d51a260b84760fd8f491",
-                "sha256:b9792b0ac0130b277536ab8944e7b754c69560dac0415dd4b2dbd16b902c8954",
-                "sha256:c9591886fc9cbe5532d5df85cb8e0cc3b44ba8ce4367bd4cf1b93dc19713da72",
-                "sha256:cf1347450c0b7644ea142712619533553f02ef23f92f781312f6a3553d031fc7",
-                "sha256:de8b4a9b56255797cbddb93281ed92acbc510fb7b15df3f01bd28f46ebc4edae",
-                "sha256:e1b1dc0372f530f26a03578ac75d5e51b3868b9b76cd2facba4c9ee0eb252ab1",
-                "sha256:e45f8e981a0ab47103181773cc0a54e650b2aef8c7b6cd07405d0fa8d869444a",
-                "sha256:e4f6d3c53911a9d103d8ec9518190e52a8b945bab021745af4939cfc7c0d4a9e",
-                "sha256:ed8a311493cf5480a2ebc597d1e177231984c818a86875126cfd004241a73c3e",
-                "sha256:ef71a1d4fd4858596ae80ad1ec76404ad29701f8ca7cdcebc50300178db14dfc"
-            ],
-            "markers": "python_version >= '3.6'",
-            "version": "==1.19.1"
+                "sha256:08308c38e44cc926bdfce99498b21eec1f848d24c302519e64203a8da99a97db",
+                "sha256:09c12096d843b90eafd01ea1b3307e78ddd47a55855ad402b157b6c4862197ce",
+                "sha256:13d166f77d6dc02c0a73c1101dd87fdf01339febec1030bd810dcd53fff3b0f1",
+                "sha256:141ec3a3300ab89c7f2b0775289954d193cc8edb621ea05f99db9cb181530512",
+                "sha256:16c1b388cc31a9baa06d91a19366fb99ddbe1c7b205293ed072211ee5bac1ed2",
+                "sha256:18bed2bcb39e3f758296584337966e68d2d5ba6aab7e038688ad53c8f889f757",
+                "sha256:1aeef46a13e51931c0b1cf8ae1168b4a55ecd282e6688fdb0a948cc5a1d5afb9",
+                "sha256:27d3f3b9e3406579a8af3a9f262f5339005dd25e0ecf3cf1559ff8a49ed5cbf2",
+                "sha256:2a2740aa9733d2e5b2dfb33639d98a64c3b0f24765fed86b0fd2aec07f6a0a08",
+                "sha256:4377e10b874e653fe96985c05feed2225c912e328c8a26541f7fc600fb9c637b",
+                "sha256:448ebb1b3bf64c0267d6b09a7cba26b5ae61b6d2dbabff7c91b660c7eccf2bdb",
+                "sha256:50e86c076611212ca62e5a59f518edafe0c0730f7d9195fec718da1a5c2bb1fc",
+                "sha256:5734bdc0342aba9dfc6f04920988140fb41234db42381cf7ccba64169f9fe7ac",
+                "sha256:64324f64f90a9e4ef732be0928be853eee378fd6a01be21a0a8469c4f2682c83",
+                "sha256:6ae6c680f3ebf1cf7ad1d7748868b39d9f900836df774c453c11c5440bc15b36",
+                "sha256:6d7593a705d662be5bfe24111af14763016765f43cb6923ed86223f965f52387",
+                "sha256:8cac8790a6b1ddf88640a9267ee67b1aee7a57dfa2d2dd33999d080bc8ee3a0f",
+                "sha256:8ece138c3a16db8c1ad38f52eb32be6086cc72f403150a79336eb2045723a1ad",
+                "sha256:9eeb7d1d04b117ac0d38719915ae169aa6b61fca227b0b7d198d43728f0c879c",
+                "sha256:a09f98011236a419ee3f49cedc9ef27d7a1651df07810ae430a6b06576e0b414",
+                "sha256:a5d897c14513590a85774180be713f692df6fa8ecf6483e561a6d47309566f37",
+                "sha256:ad6f2ff5b1989a4899bf89800a671d71b1612e5ff40866d1f4d8bcf48d4e5764",
+                "sha256:c42c4b73121caf0ed6cd795512c9c09c52a7287b04d105d112068c1736d7c753",
+                "sha256:cb1017eec5257e9ac6209ac172058c430e834d5d2bc21961dceeb79d111e5909",
+                "sha256:d6c7bb82883680e168b55b49c70af29b84b84abb161cbac2800e8fcb6f2109b6",
+                "sha256:e452dc66e08a4ce642a961f134814258a082832c78c90351b75c41ad16f79f63",
+                "sha256:e5b6ed0f0b42317050c88022349d994fe72bfe35f5908617512cd8c8ef9da2a9",
+                "sha256:e9b30d4bd69498fc0c3fe9db5f62fffbb06b8eb9321f92cc970f2969be5e3949",
+                "sha256:ec149b90019852266fec2341ce1db513b843e496d5a8e8cdb5ced1923a92faab",
+                "sha256:edb01671b3caae1ca00881686003d16c2209e07b7ef8b7639f1867852b948f7c",
+                "sha256:f0d3929fe88ee1c155129ecd82f981b8856c5d97bcb0d5f23e9b4242e79d1de3",
+                "sha256:f29454410db6ef8126c83bd3c968d143304633d45dc57b51252afbd79d700893",
+                "sha256:fe45becb4c2f72a0907c1d0246ea6449fe7a9e2293bb0e11c4e9a32bb0930a15",
+                "sha256:fedbd128668ead37f33917820b704784aff695e0019309ad446a6d0b065b57e4"
+            ],
+            "version": "==1.19.4"
         },
         "obonet": {
             "hashes": [
@@ -143,7 +147,6 @@
                 "sha256:4357f74f47b9c12db93624a82154e9b120fa8293699949152b22065d556079f8",
                 "sha256:998416ba6962ae7fbd6596850b80e17859a5753ba17c32284f67bfff33784181"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==20.4"
         },
         "pandas": {
@@ -173,7 +176,6 @@
                 "sha256:15b2acde666561e1298d71b523007ed7364de07029219b604cf808bfa1c765b0",
                 "sha256:966c145cd83c96502c3c3868f50408687b38434af77734af1e9ca461a4081d2d"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==0.13.1"
         },
         "py": {
@@ -181,7 +183,6 @@
                 "sha256:366389d1db726cd2fcfc79732e75410e5fe4d31db13692115529d34069a043c2",
                 "sha256:9ca6883ce56b4e8da7e79ac18787889fa5206c79dcc67fb065376cd2fe03f342"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==1.9.0"
         },
         "pyparsing": {
@@ -189,7 +190,6 @@
                 "sha256:c203ec8783bf771a155b207279b9bccb8dea02d8f0c9e5f8ead507bc3246ecc1",
                 "sha256:ef9d7589ef3c200abe66653d3f1ab1033c3c419ae9b9bdb1240a85b024efc88b"
             ],
-            "markers": "python_version >= '2.6' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==2.4.7"
         },
         "pytest": {
@@ -205,15 +205,14 @@
                 "sha256:73ebfe9dbf22e832286dafa60473e4cd239f8592f699aa5adaf10050e6e1823c",
                 "sha256:75bb3f31ea686f1197762692a9ee6a7550b59fc6ca3a1f4b5d7e32fb98e2da2a"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==2.8.1"
         },
         "pytz": {
             "hashes": [
-                "sha256:a494d53b6d39c3c6e44c3bec237336e14305e4f29bbf800b599253057fbb79ed",
-                "sha256:c35965d010ce31b23eeb663ed3cc8c906275d6be1a34393a1d73a41febf4a048"
+                "sha256:3e6b7dd2d1e0a59084bcee14a17af60c5c562cdc16d828e8eba2e683d3a7e268",
+                "sha256:5c55e189b682d420be27c6995ba6edce0c0a77dd67bfbe2ae6607134d5851ffd"
             ],
-            "version": "==2020.1"
+            "version": "==2020.4"
         },
         "requests": {
             "hashes": [
@@ -228,23 +227,21 @@
                 "sha256:30639c035cdb23534cd4aa2dd52c3bf48f06e5f4a941509c8bafd8ce11080259",
                 "sha256:8b74bedcbbbaca38ff6d7491d76f2b06b3592611af620f8426e82dddb04a5ced"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==1.15.0"
         },
         "toml": {
             "hashes": [
-                "sha256:926b612be1e5ce0634a2ca03470f95169cf16f939018233a670519cb4ac58b0f",
-                "sha256:bda89d5935c2eac546d648028b9901107a595863cb36bae0c73ac804a9b4ce88"
+                "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b",
+                "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"
             ],
-            "version": "==0.10.1"
+            "version": "==0.10.2"
         },
         "urllib3": {
             "hashes": [
-                "sha256:91056c15fa70756691db97756772bb1eb9678fa585d9184f24534b100dc60f4a",
-                "sha256:e7983572181f5e1522d9c98453462384ee92a0be7fac5f1413a1e35c56cc0461"
+                "sha256:8d7eaa5a82a1cac232164990f04874c594c9453ec55eef02eab885aa02fc17a2",
+                "sha256:f5321fbe4bf3fefa0efd0bfe7fb14e90909eb62a48ccda331726b4319897dd5e"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4' and python_version < '4'",
-            "version": "==1.25.10"
+            "version": "==1.25.11"
         }
     },
     "develop": {
@@ -255,29 +252,49 @@
             ],
             "version": "==0.7.12"
         },
-        "appnope": {
+        "argon2-cffi": {
             "hashes": [
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+                "sha256:9dfd5197852530294ecb5795c97a823839258dfd5eb9420233c7cfedec2058f2",
+                "sha256:b160416adc0f012fb1f12588a5e6954889510f82f698e23ed4f4fa57f12a0647",
+                "sha256:ba7209b608945b889457f949cc04c8e762bed4fe3fec88ae9a6b7765ae82e496",
+                "sha256:cc0e028b209a5483b6846053d5fd7165f460a1f14774d79e632e75e7ae64b82b",
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+                "sha256:e2db6e85c057c16d0bd3b4d2b04f270a7467c147381e8fd73cbbe5bc719832be"
             ],
-            "markers": "sys_platform == 'darwin' and platform_system == 'Darwin'",
-            "version": "==0.1.0"
+            "version": "==20.1.0"
+        },
+        "async-generator": {
+            "hashes": [
+                "sha256:01c7bf666359b4967d2cda0000cc2e4af16a0ae098cbffcb8472fb9e8ad6585b",
+                "sha256:6ebb3d106c12920aaae42ccb6f787ef5eefdcdd166ea3d628fa8476abe712144"
+            ],
+            "version": "==1.10"
         },
         "attrs": {
             "hashes": [
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+                "sha256:31b2eced602aa8423c2aea9c76a724617ed67cf9513173fd3a4f03e3a929c7e6",
+                "sha256:832aa3cde19744e49938b91fea06d69ecb9e649c93ba974535d08ad92164f700"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
-            "version": "==19.3.0"
+            "version": "==20.3.0"
         },
         "babel": {
             "hashes": [
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-            "version": "==2.8.0"
+            "version": "==2.9.0"
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         "backcall": {
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@@ -293,20 +310,67 @@
             "index": "pypi",
             "version": "==1.0.0"
         },
+        "backports.functools-lru-cache": {
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-            "version": "==3.1.5"
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@@ -329,43 +393,42 @@
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@@ -386,7 +449,6 @@
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@@ -402,7 +464,6 @@
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@@ -410,7 +471,6 @@
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@@ -418,7 +478,6 @@
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@@ -426,31 +485,29 @@
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@@ -471,7 +528,6 @@
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@@ -479,7 +535,6 @@
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@@ -500,52 +555,68 @@
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@@ -583,7 +654,6 @@
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@@ -624,29 +694,33 @@
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@@ -658,43 +732,50 @@
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@@ -708,7 +789,6 @@
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@@ -735,16 +815,15 @@
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@@ -767,23 +846,21 @@
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@@ -798,30 +875,34 @@
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@@ -864,15 +945,14 @@
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@@ -892,44 +972,42 @@
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@@ -958,7 +1036,6 @@
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@@ -981,7 +1058,6 @@
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@@ -989,7 +1065,6 @@
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@@ -997,7 +1072,6 @@
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@@ -1005,7 +1079,6 @@
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@@ -1013,7 +1086,6 @@
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@@ -1021,12 +1093,10 @@
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@@ -1040,13 +1110,20 @@
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@@ -1057,46 +1134,76 @@
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