diff --git a/src/holt59/aoc/2023/day22.py b/src/holt59/aoc/2023/day22.py
index 992bf35..1ee51cf 100644
--- a/src/holt59/aoc/2023/day22.py
+++ b/src/holt59/aoc/2023/day22.py
@@ -1,13 +1,111 @@
+import itertools
+import logging
+import os
+import string
 import sys
 from collections import defaultdict
-from dataclasses import dataclass
+
+VERBOSE = os.getenv("AOC_VERBOSE") == "True"
+logging.basicConfig(level=logging.INFO if VERBOSE else logging.WARNING)
+
 
 lines = sys.stdin.read().splitlines()
 
+
+def _name(i: int) -> str:
+    if len(lines) < 26:
+        return string.ascii_uppercase[i]
+    return f"B{i:04d}"
+
+
+def build_supports(
+    bricks: list[tuple[tuple[int, int, int], tuple[int, int, int]]]
+) -> tuple[dict[int, set[int]], dict[int, set[int]]]:
+    # 1. compute locations where a brick of sand will land after falling by processing
+    # them in sorted order of bottom z location
+    levels: dict[tuple[int, int, int], int] = defaultdict(lambda: -1)
+    for i_brick, ((sx, sy, sz), (ex, ey, ez)) in enumerate(bricks):
+        assert sx <= ex and sy <= ey and sz <= ez
+
+        xs, ys = range(sx, ex + 1), range(sy, ey + 1)
+
+        for z in range(sz - 1, 0, -1):
+            if any(levels[x, y, z] >= 0 for x, y in itertools.product(xs, ys)):
+                break
+            sz, ez = sz - 1, ez - 1
+
+        bricks[i_brick] = ((sx, sy, sz), (ex, ey, ez))
+        zs = range(sz, ez + 1)
+
+        for x, y, z in itertools.product(xs, ys, zs):
+            levels[x, y, z] = i_brick
+
+    # 2. compute the bricks that supports any brick
+    supported_by: dict[int, set[int]] = {}
+    supports: dict[int, set[int]] = {i_brick: set() for i_brick in range(len(bricks))}
+    for i_brick, ((sx, sy, sz), (ex, ey, ez)) in enumerate(bricks):
+        name = _name(i_brick)
+
+        supported_by[i_brick] = {
+            v
+            for x, y in itertools.product(range(sx, ex + 1), range(sy, ey + 1))
+            if (v := levels[x, y, sz - 1]) != -1
+        }
+        logging.info(
+            f"{name} supported by {', '.join(map(_name, supported_by[i_brick]))}"
+        )
+
+        for support in supported_by[i_brick]:
+            supports[support].add(i_brick)
+
+    return supported_by, supports
+
+
+bricks: list[tuple[tuple[int, int, int], tuple[int, int, int]]] = []
+for line in lines:
+    bricks.append(
+        (
+            tuple(int(c) for c in line.split("~")[0].split(",")),  # type: ignore
+            tuple(int(c) for c in line.split("~")[1].split(",")),  # type: ignore
+        )
+    )
+
+# sort bricks by bottom z position to compute supports
+bricks = sorted(bricks, key=lambda b: b[0][-1])
+supported_by, supports = build_supports(bricks)
+
 # part 1
-answer_1 = ...
+answer_1 = len(bricks) - sum(
+    any(len(supported_by[supported]) == 1 for supported in supports_to)
+    for supports_to in supports.values()
+)
 print(f"answer 1 is {answer_1}")
 
 # part 2
-answer_2 = ...
+falling_in_chain: dict[int, set[int]] = {}
+for i_brick in range(len(bricks)):
+    to_disintegrate: set[int] = {
+        supported
+        for supported in supports[i_brick]
+        if len(supported_by[supported]) == 1
+    }
+
+    supported_by_copy = dict(supported_by)
+
+    falling_in_chain[i_brick] = set()
+    while to_disintegrate:
+        falling_in_chain[i_brick].update(to_disintegrate)
+
+        to_disintegrate_v: set[int] = set()
+
+        for d_brick in to_disintegrate:
+            for supported in supports[d_brick]:
+                supported_by_copy[supported] = supported_by_copy[supported] - {d_brick}
+
+                if not supported_by_copy[supported]:
+                    to_disintegrate_v.add(supported)
+
+        to_disintegrate = to_disintegrate_v
+
+answer_2 = sum(len(falling) for falling in falling_in_chain.values())
 print(f"answer 2 is {answer_2}")
diff --git a/src/holt59/aoc/inputs/holt59/2023/day22.txt b/src/holt59/aoc/inputs/holt59/2023/day22.txt
index e69de29..3302903 100644
--- a/src/holt59/aoc/inputs/holt59/2023/day22.txt
+++ b/src/holt59/aoc/inputs/holt59/2023/day22.txt
@@ -0,0 +1,1429 @@
+2,1,211~2,3,211
+1,0,37~1,1,37
+3,3,230~4,3,230
+5,5,18~5,6,18
+3,3,130~3,6,130
+6,8,218~6,9,218
+6,3,239~8,3,239
+4,4,30~6,4,30
+7,4,74~7,6,74
+3,3,251~6,3,251
+2,0,189~2,2,189
+5,5,133~7,5,133
+1,6,194~1,8,194
+5,0,200~5,2,200
+8,2,273~8,2,274
+7,7,155~7,7,157
+3,0,267~3,1,267
+3,7,57~3,9,57
+1,3,134~1,5,134
+1,6,155~1,6,155
+0,2,276~0,4,276
+1,6,9~1,8,9
+5,4,277~8,4,277
+4,5,71~4,5,73
+1,6,314~1,8,314
+6,0,244~9,0,244
+2,2,256~2,5,256
+5,7,117~7,7,117
+0,0,1~0,1,1
+5,0,26~5,1,26
+6,3,80~7,3,80
+6,5,189~6,6,189
+9,2,26~9,4,26
+3,5,216~3,7,216
+5,6,138~5,9,138
+6,5,226~8,5,226
+8,0,219~8,1,219
+6,9,193~9,9,193
+6,6,329~6,9,329
+6,0,285~6,1,285
+8,4,215~9,4,215
+4,6,222~4,9,222
+5,2,241~6,2,241
+1,6,183~4,6,183
+5,5,196~5,7,196
+6,0,286~9,0,286
+0,3,72~2,3,72
+3,8,50~3,8,52
+3,2,59~4,2,59
+9,1,201~9,3,201
+0,7,281~0,9,281
+6,4,324~8,4,324
+3,6,53~3,8,53
+8,6,111~8,7,111
+6,4,66~8,4,66
+4,7,316~6,7,316
+0,4,105~0,6,105
+2,1,200~4,1,200
+0,8,247~3,8,247
+1,3,119~2,3,119
+5,9,47~9,9,47
+0,7,58~0,9,58
+8,3,242~8,3,244
+9,2,117~9,5,117
+0,7,110~1,7,110
+7,2,43~7,3,43
+6,0,180~6,2,180
+2,3,178~2,6,178
+5,0,98~5,0,99
+8,6,280~8,7,280
+0,9,158~2,9,158
+5,4,237~7,4,237
+4,7,269~6,7,269
+0,9,200~2,9,200
+1,2,27~1,4,27
+4,4,68~4,6,68
+1,4,136~2,4,136
+7,7,285~8,7,285
+3,6,323~4,6,323
+5,2,45~6,2,45
+9,2,170~9,3,170
+6,4,190~6,5,190
+6,0,238~6,2,238
+2,0,93~4,0,93
+7,1,66~9,1,66
+6,6,248~6,8,248
+1,2,2~2,2,2
+0,6,2~0,8,2
+4,2,56~4,2,57
+3,7,238~4,7,238
+0,5,254~3,5,254
+0,7,12~0,9,12
+2,4,161~2,6,161
+2,7,45~5,7,45
+0,8,3~3,8,3
+4,8,290~7,8,290
+0,6,321~2,6,321
+2,6,104~2,6,106
+0,2,135~2,2,135
+7,6,121~7,7,121
+8,3,22~9,3,22
+4,9,254~4,9,257
+3,6,194~3,9,194
+6,1,248~8,1,248
+6,2,85~6,5,85
+1,3,22~3,3,22
+2,4,102~3,4,102
+4,6,119~6,6,119
+8,0,13~8,2,13
+0,8,188~2,8,188
+3,1,263~4,1,263
+5,6,329~5,8,329
+8,3,251~8,5,251
+7,4,126~7,7,126
+6,4,70~6,6,70
+8,2,2~8,5,2
+6,5,285~6,8,285
+0,6,76~1,6,76
+3,5,110~3,7,110
+1,4,71~1,6,71
+7,8,60~9,8,60
+4,1,227~4,4,227
+6,7,20~8,7,20
+6,2,139~9,2,139
+4,0,226~5,0,226
+9,3,13~9,3,15
+0,7,95~0,9,95
+0,6,313~1,6,313
+5,8,123~5,9,123
+8,6,249~9,6,249
+2,5,317~3,5,317
+5,0,83~5,2,83
+5,5,328~6,5,328
+0,7,300~2,7,300
+7,2,56~7,5,56
+1,5,238~1,7,238
+1,4,225~1,5,225
+7,8,295~7,9,295
+2,0,324~2,0,326
+0,6,320~3,6,320
+7,4,5~7,6,5
+5,3,151~5,6,151
+6,0,254~8,0,254
+6,7,310~8,7,310
+2,6,243~3,6,243
+5,6,72~6,6,72
+1,2,97~3,2,97
+1,8,196~4,8,196
+9,7,67~9,9,67
+5,4,126~5,6,126
+0,2,92~0,4,92
+4,8,238~7,8,238
+5,6,132~5,9,132
+7,4,147~8,4,147
+6,6,138~8,6,138
+8,4,290~9,4,290
+8,7,249~8,9,249
+7,8,330~9,8,330
+2,0,138~2,0,139
+7,7,328~7,9,328
+3,0,294~5,0,294
+4,9,119~6,9,119
+6,3,91~6,6,91
+3,7,113~3,9,113
+8,2,173~8,4,173
+9,8,165~9,9,165
+0,2,68~2,2,68
+0,4,126~0,5,126
+0,0,26~2,0,26
+6,5,17~6,7,17
+6,0,147~9,0,147
+0,6,276~0,7,276
+3,1,316~3,3,316
+2,6,230~2,9,230
+1,5,188~1,5,189
+8,1,193~8,1,193
+1,1,30~1,2,30
+3,4,330~3,5,330
+7,5,249~9,5,249
+6,8,58~7,8,58
+7,5,101~7,7,101
+1,9,205~3,9,205
+9,5,7~9,7,7
+0,2,61~0,5,61
+2,5,238~2,7,238
+1,9,252~4,9,252
+9,2,262~9,4,262
+0,1,71~0,2,71
+0,0,211~2,0,211
+3,0,265~3,1,265
+0,4,128~2,4,128
+0,0,86~0,1,86
+4,0,182~4,1,182
+0,7,35~3,7,35
+2,7,154~2,9,154
+1,8,133~1,9,133
+1,4,34~1,4,36
+5,4,99~5,7,99
+1,3,232~3,3,232
+5,9,55~8,9,55
+6,7,280~6,9,280
+8,1,37~8,1,39
+3,0,327~4,0,327
+7,4,48~7,6,48
+6,8,101~9,8,101
+6,8,209~8,8,209
+0,0,240~2,0,240
+0,2,73~2,2,73
+9,4,1~9,6,1
+0,3,64~2,3,64
+1,8,82~1,8,83
+0,9,17~0,9,18
+6,3,115~8,3,115
+3,7,304~5,7,304
+3,1,10~3,3,10
+5,8,154~8,8,154
+4,0,271~4,0,271
+6,4,330~9,4,330
+5,4,154~5,6,154
+3,1,327~3,4,327
+4,7,318~4,7,320
+4,3,44~4,5,44
+7,5,246~7,7,246
+7,5,8~7,8,8
+1,2,213~4,2,213
+5,0,229~8,0,229
+9,5,112~9,6,112
+6,6,122~6,8,122
+5,1,207~5,2,207
+2,9,296~2,9,298
+0,2,131~0,4,131
+3,6,52~3,7,52
+3,0,138~5,0,138
+3,5,98~6,5,98
+5,2,204~6,2,204
+2,4,15~2,4,17
+0,0,330~1,0,330
+6,1,9~8,1,9
+2,1,123~2,3,123
+1,7,279~2,7,279
+0,3,275~0,4,275
+4,6,71~4,8,71
+1,1,237~2,1,237
+7,8,132~8,8,132
+5,7,279~8,7,279
+2,0,322~2,2,322
+4,0,193~6,0,193
+3,0,234~3,3,234
+9,4,165~9,7,165
+0,1,65~0,3,65
+5,1,31~7,1,31
+5,0,292~5,3,292
+2,8,251~3,8,251
+4,6,256~4,8,256
+2,6,133~4,6,133
+4,0,35~7,0,35
+5,1,101~5,2,101
+1,5,160~1,7,160
+7,5,99~7,8,99
+4,6,189~5,6,189
+0,7,232~3,7,232
+4,0,22~4,2,22
+0,3,273~0,6,273
+5,9,250~5,9,251
+1,4,67~1,6,67
+8,4,150~8,5,150
+8,5,57~8,5,59
+1,5,313~3,5,313
+4,7,75~6,7,75
+4,6,195~6,6,195
+3,6,154~3,8,154
+4,4,331~6,4,331
+7,3,137~9,3,137
+4,0,33~7,0,33
+5,7,294~5,9,294
+0,3,59~0,5,59
+7,4,318~7,7,318
+4,4,80~6,4,80
+7,7,102~9,7,102
+8,5,21~8,8,21
+2,0,212~4,0,212
+4,4,257~6,4,257
+4,0,30~6,0,30
+5,8,124~7,8,124
+3,4,88~6,4,88
+3,3,218~5,3,218
+9,1,69~9,3,69
+8,4,17~8,7,17
+3,1,335~3,4,335
+6,0,298~6,0,300
+4,7,87~4,9,87
+2,3,96~4,3,96
+6,6,324~6,8,324
+0,7,305~2,7,305
+4,6,184~6,6,184
+7,3,49~7,5,49
+6,0,201~8,0,201
+0,6,62~1,6,62
+9,5,280~9,7,280
+2,0,233~2,2,233
+0,0,29~2,0,29
+2,4,269~4,4,269
+3,3,314~3,5,314
+6,4,268~6,6,268
+0,4,197~3,4,197
+3,6,198~3,9,198
+6,8,309~9,8,309
+1,6,64~1,8,64
+1,0,120~1,1,120
+3,0,90~5,0,90
+6,7,216~7,7,216
+0,1,33~2,1,33
+4,2,147~5,2,147
+1,2,67~3,2,67
+6,6,266~8,6,266
+4,0,200~4,0,202
+2,0,329~2,0,331
+4,8,51~6,8,51
+2,3,184~3,3,184
+4,3,49~6,3,49
+5,2,51~5,2,52
+0,9,9~2,9,9
+2,4,103~5,4,103
+1,5,74~3,5,74
+6,7,326~9,7,326
+3,9,259~6,9,259
+1,3,40~1,4,40
+4,5,36~6,5,36
+7,5,292~7,8,292
+2,5,290~2,8,290
+6,3,133~9,3,133
+2,2,51~4,2,51
+1,3,315~4,3,315
+1,9,88~3,9,88
+2,5,318~4,5,318
+6,4,255~7,4,255
+7,6,214~7,8,214
+2,3,131~5,3,131
+6,1,30~9,1,30
+5,5,235~5,6,235
+6,9,58~8,9,58
+1,7,219~4,7,219
+0,3,121~1,3,121
+8,1,225~8,1,227
+4,1,248~4,2,248
+4,6,204~4,8,204
+4,1,188~5,1,188
+4,9,74~7,9,74
+4,2,19~6,2,19
+4,0,61~4,2,61
+2,4,3~2,5,3
+2,3,254~5,3,254
+3,6,148~6,6,148
+7,1,7~9,1,7
+6,4,137~6,4,138
+4,6,67~4,7,67
+3,6,31~6,6,31
+0,5,197~2,5,197
+3,4,317~4,4,317
+6,3,288~6,3,288
+5,8,261~7,8,261
+7,5,79~9,5,79
+6,9,263~6,9,266
+6,6,243~8,6,243
+5,3,224~8,3,224
+4,4,174~4,7,174
+7,2,93~7,2,96
+4,3,168~4,3,168
+0,9,156~2,9,156
+2,6,74~4,6,74
+5,1,287~5,4,287
+1,6,66~4,6,66
+5,5,129~9,5,129
+7,0,188~9,0,188
+8,4,37~8,5,37
+1,8,80~3,8,80
+4,0,296~7,0,296
+2,4,57~2,6,57
+0,5,58~1,5,58
+3,4,199~3,5,199
+6,4,79~8,4,79
+0,3,83~1,3,83
+5,9,254~7,9,254
+4,0,230~7,0,230
+1,4,223~2,4,223
+0,3,247~1,3,247
+4,2,99~8,2,99
+2,5,232~5,5,232
+1,1,292~1,4,292
+9,1,144~9,4,144
+5,5,256~5,6,256
+7,5,212~9,5,212
+4,6,24~4,8,24
+7,3,327~7,4,327
+1,3,217~4,3,217
+8,0,54~8,0,55
+4,6,213~4,7,213
+4,7,268~4,9,268
+4,8,187~7,8,187
+6,9,49~9,9,49
+0,6,182~2,6,182
+9,8,63~9,9,63
+5,3,142~5,5,142
+6,4,104~9,4,104
+6,8,211~8,8,211
+5,2,226~5,5,226
+3,6,115~6,6,115
+0,2,240~1,2,240
+4,5,213~6,5,213
+0,4,194~0,7,194
+1,0,188~1,1,188
+5,4,139~6,4,139
+4,0,186~7,0,186
+8,6,58~8,6,58
+3,0,207~5,0,207
+6,6,190~6,6,192
+1,9,85~3,9,85
+0,1,95~0,2,95
+5,6,32~5,8,32
+5,1,274~5,3,274
+3,8,244~3,9,244
+7,9,167~9,9,167
+6,4,32~6,6,32
+1,8,44~5,8,44
+6,8,55~8,8,55
+4,7,48~4,8,48
+2,7,199~2,9,199
+6,8,97~6,8,97
+8,1,275~9,1,275
+5,3,225~5,5,225
+8,8,144~8,8,146
+4,1,114~4,4,114
+1,6,233~3,6,233
+7,1,270~7,4,270
+5,0,197~7,0,197
+6,6,78~9,6,78
+3,5,197~3,7,197
+7,3,323~7,5,323
+9,6,8~9,8,8
+2,5,335~4,5,335
+1,4,329~3,4,329
+1,7,214~3,7,214
+0,3,334~1,3,334
+2,2,321~2,3,321
+0,1,7~0,1,8
+1,5,158~3,5,158
+6,6,116~6,7,116
+8,5,56~8,6,56
+2,3,284~5,3,284
+2,3,32~2,5,32
+2,4,164~2,6,164
+3,4,131~3,4,132
+8,8,164~8,8,166
+1,8,317~1,9,317
+5,2,236~5,3,236
+3,5,77~3,6,77
+5,0,183~7,0,183
+8,5,329~8,8,329
+5,1,96~7,1,96
+1,6,311~3,6,311
+0,1,333~0,4,333
+3,5,180~4,5,180
+3,7,122~3,7,125
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+7,1,230~9,1,230
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+5,3,234~5,3,234
+7,5,20~8,5,20
+0,6,102~3,6,102
+3,3,19~4,3,19
+8,1,146~8,3,146
+2,8,203~2,9,203
+7,1,4~9,1,4
+0,2,58~0,4,58
+2,2,214~4,2,214
+9,4,185~9,4,186
+6,6,94~6,8,94
+3,4,63~6,4,63
+1,5,69~1,5,69
+3,1,203~4,1,203
+3,1,338~4,1,338
+3,4,65~5,4,65
+7,9,137~9,9,137
+2,0,210~3,0,210
+1,1,214~1,3,214
+9,1,61~9,4,61
+0,6,20~0,6,22
+8,6,183~8,8,183
+5,5,73~5,7,73
+8,9,280~8,9,282
+2,4,156~2,5,156
+0,3,19~0,3,20
+2,6,294~5,6,294
+2,8,195~3,8,195
+2,4,96~2,7,96
+0,7,108~0,9,108
+6,1,65~9,1,65
+1,1,68~3,1,68
+4,0,197~4,3,197
+6,0,39~7,0,39
+1,3,178~1,5,178
+0,9,155~0,9,155
+4,2,23~7,2,23
+3,5,97~3,8,97
+0,0,4~0,3,4
+6,3,236~6,5,236
+4,2,268~4,3,268
+5,9,255~8,9,255
+8,8,205~8,8,207
+1,0,284~1,2,284
+7,4,78~8,4,78
+7,7,261~8,7,261
+3,2,301~6,2,301
+5,0,199~8,0,199
+6,6,151~8,6,151
+0,2,323~1,2,323
+0,1,34~2,1,34
+2,8,83~2,9,83
+6,3,317~6,6,317
+3,4,74~5,4,74
+4,4,110~7,4,110
+4,4,14~4,5,14
+8,2,117~8,4,117
+5,8,131~8,8,131
+5,1,119~5,2,119
+2,7,251~4,7,251
+8,3,205~8,6,205
+1,5,288~1,7,288
+5,1,218~5,2,218
+6,5,72~7,5,72
+9,2,136~9,4,136
+3,2,271~3,5,271
+5,7,238~5,7,241
+7,7,296~7,9,296
+1,7,309~2,7,309
+8,0,278~8,2,278
+4,3,97~5,3,97
+4,5,183~4,5,185
+6,5,234~6,6,234
+4,1,37~5,1,37
+0,9,151~3,9,151
+7,2,25~7,4,25
+2,5,179~3,5,179
+2,3,156~3,3,156
+2,9,81~4,9,81
+2,6,201~4,6,201
+0,1,217~1,1,217
+3,1,317~3,3,317
+1,1,117~1,2,117
+4,3,231~8,3,231
+0,1,136~2,1,136
+3,1,85~3,2,85
+9,4,139~9,7,139
+2,9,51~4,9,51
+6,9,278~8,9,278
+2,7,7~2,9,7
+7,6,52~7,9,52
+5,2,68~5,4,68
+2,2,230~4,2,230
+6,0,6~9,0,6
+0,7,197~0,7,198
+7,8,264~9,8,264
+1,2,278~3,2,278
+9,2,71~9,3,71
+7,6,242~7,8,242
+1,3,69~2,3,69
+2,2,288~2,4,288
+1,5,285~1,5,287
+7,1,273~9,1,273
+8,5,259~8,7,259
+5,1,151~7,1,151
+7,6,153~7,8,153
+0,0,139~0,0,141
+6,7,29~8,7,29
+7,6,196~9,6,196
+1,7,127~4,7,127
+3,8,127~5,8,127
+0,5,18~0,6,18
+0,3,272~2,3,272
+1,1,102~3,1,102
+2,5,28~5,5,28
+4,1,287~4,3,287
+6,7,239~6,9,239
+0,2,83~2,2,83
+3,5,310~3,7,310
+5,1,302~7,1,302
+9,4,184~9,7,184
+1,8,151~1,8,152
+6,0,27~9,0,27
+1,4,84~2,4,84
+3,6,95~5,6,95
+4,7,189~4,9,189
+4,2,221~6,2,221
+5,1,232~6,1,232
+4,4,318~6,4,318
+3,0,204~6,0,204
+8,7,276~9,7,276
+5,5,326~7,5,326
+3,2,79~3,5,79
+5,1,295~5,1,297
+5,3,286~8,3,286
+9,6,186~9,7,186
+2,3,209~4,3,209
+0,4,319~2,4,319
+0,7,188~3,7,188
+4,0,2~4,2,2
+8,4,83~9,4,83
+2,5,59~3,5,59
+2,2,48~5,2,48
+3,5,90~3,7,90
+1,0,215~1,2,215
+7,5,196~8,5,196
+9,6,250~9,9,250
+1,3,329~4,3,329
+7,4,313~7,7,313
+9,2,10~9,5,10
+9,3,146~9,4,146
+4,3,81~6,3,81
+2,1,275~2,3,275
+0,4,243~2,4,243
+3,5,29~3,7,29
+1,7,46~1,8,46
+6,0,188~6,0,191
+6,6,202~6,8,202
+4,8,79~5,8,79
+0,6,257~2,6,257
+7,8,142~8,8,142
+7,1,198~9,1,198
+1,2,282~3,2,282
+5,9,89~5,9,92
+2,1,245~4,1,245
+5,9,297~5,9,297
+2,1,317~2,4,317
+7,5,282~7,7,282
+3,7,55~3,9,55
+7,4,148~8,4,148
+5,1,81~7,1,81
+4,1,322~7,1,322
+8,3,19~8,3,21
+2,9,71~4,9,71
+2,6,194~2,9,194
+3,3,32~3,5,32
+5,0,150~7,0,150
+0,9,260~3,9,260
+2,7,211~4,7,211
+4,4,117~6,4,117
+0,0,190~2,0,190
+2,9,118~4,9,118
+9,5,324~9,8,324
+7,4,150~7,5,150
+4,6,97~5,6,97
+7,0,3~7,0,3
+0,1,81~0,1,84
+6,2,143~7,2,143
+1,3,238~4,3,238
+2,0,270~4,0,270
+2,2,17~2,2,17
+5,8,161~8,8,161
+1,1,116~5,1,116
+1,4,240~2,4,240
+1,0,251~1,3,251
+4,1,11~4,4,11
+5,0,185~7,0,185
+7,7,205~9,7,205
+5,9,143~7,9,143
+5,7,143~5,8,143
+4,2,125~6,2,125
+8,7,160~8,8,160
+3,7,230~3,8,230
+5,0,3~5,0,6
+6,6,327~6,8,327
+2,6,1~4,6,1
+2,1,240~2,3,240
+4,0,252~7,0,252
+4,1,143~8,1,143
+6,7,85~8,7,85
+2,1,295~2,1,298
+3,1,8~5,1,8
+4,6,236~4,9,236
+9,8,4~9,9,4
+3,0,6~3,3,6
+2,3,18~4,3,18
+0,6,289~1,6,289
+3,5,160~5,5,160
+8,6,246~8,8,246
+0,7,13~0,8,13
+4,7,287~4,9,287
+3,4,164~4,4,164
+4,1,179~4,5,179
+7,1,97~8,1,97
+0,2,16~0,5,16
+3,4,72~3,6,72
+1,3,59~1,6,59
+2,4,165~2,5,165
+9,0,263~9,2,263
+1,6,108~3,6,108
+2,4,277~2,7,277
+5,7,86~5,9,86
+0,2,14~0,4,14
+0,1,248~2,1,248
+9,5,29~9,7,29
+1,9,37~1,9,40
+4,3,141~4,6,141
+7,8,215~9,8,215
+0,9,153~2,9,153
+7,7,182~9,7,182
+2,6,265~5,6,265
+0,2,44~0,3,44
+7,3,301~9,3,301
+8,2,16~8,4,16
+5,2,288~5,2,290
+0,2,242~0,2,244
+4,5,146~6,5,146
+3,9,41~6,9,41
+3,2,34~6,2,34
+3,4,229~5,4,229
+2,5,322~5,5,322
+6,0,148~9,0,148
+4,0,134~5,0,134
+6,7,308~6,9,308
+6,5,87~6,7,87
+4,5,134~5,5,134
+5,3,17~5,5,17
+5,4,265~7,4,265
+2,2,86~4,2,86
+7,0,91~7,4,91
+7,2,1~9,2,1
+1,5,150~1,8,150
+0,1,215~0,4,215
+8,7,157~8,8,157
+7,8,163~9,8,163
+3,4,2~7,4,2
+9,8,51~9,8,52
+5,5,84~5,7,84
+7,1,235~7,3,235
+7,4,331~7,6,331
+2,1,186~2,4,186
+7,9,329~7,9,329
+4,6,308~4,9,308
+4,4,91~4,5,91
+2,8,141~5,8,141
+5,3,112~5,4,112
+2,3,113~2,6,113
+9,4,289~9,6,289
+8,2,153~8,5,153
+0,8,19~0,8,19
+6,3,140~6,4,140
+0,0,192~0,3,192
+4,4,126~4,6,126
+6,7,142~9,7,142
+5,8,3~5,9,3
+2,2,100~2,4,100
+1,5,306~1,8,306
+3,3,181~4,3,181
+2,2,16~5,2,16
+5,5,121~7,5,121
+0,8,16~0,9,16
+1,7,144~2,7,144
+2,7,282~4,7,282
+0,8,61~0,9,61
+5,6,139~5,6,141
+4,4,260~5,4,260
+5,5,210~7,5,210
+0,4,133~0,6,133
+1,4,204~1,6,204
+7,5,120~7,7,120
+5,4,165~5,7,165
+9,8,70~9,8,72
+8,5,181~8,6,181
+3,9,277~7,9,277
+2,9,50~5,9,50
+1,7,252~3,7,252
+1,2,53~4,2,53
+2,2,241~2,4,241
+2,6,312~4,6,312
+6,5,319~6,5,319
+9,7,241~9,9,241
+9,7,251~9,9,251
+1,4,39~5,4,39
+4,6,285~4,7,285
+0,1,194~0,3,194
+3,9,293~5,9,293
+7,0,325~7,2,325
+2,9,128~4,9,128
+0,3,219~0,5,219
+2,6,292~2,8,292
+4,2,320~4,5,320
+1,5,133~2,5,133
+7,2,261~7,4,261
+1,0,243~2,0,243
+9,6,80~9,6,82
+1,0,185~1,2,185
+3,7,120~4,7,120
+7,5,140~7,7,140
+6,0,144~6,2,144
+9,7,2~9,9,2
+4,2,167~6,2,167
+3,2,94~3,6,94
+3,9,154~4,9,154
+8,5,224~8,7,224
+0,4,123~2,4,123
+8,5,194~8,7,194
+4,7,80~4,9,80
+1,0,328~3,0,328
+2,8,76~5,8,76
+1,8,298~3,8,298
+5,3,77~7,3,77
+3,2,202~3,3,202
+0,2,336~0,2,339
+2,0,24~6,0,24
+6,3,209~6,6,209
+4,7,145~4,9,145
+8,6,113~8,8,113
+5,2,334~5,4,334
+3,9,116~6,9,116
+5,7,309~6,7,309
+2,2,116~2,3,116
+1,9,294~4,9,294
+1,1,138~3,1,138
+6,7,52~6,8,52
+3,0,262~3,1,262
+2,6,288~4,6,288
+6,6,183~6,8,183
+6,1,319~6,3,319
+7,6,55~8,6,55
+7,3,50~9,3,50
+0,4,82~3,4,82
+1,6,262~2,6,262
+7,3,112~7,5,112
+4,2,302~7,2,302
+1,3,24~1,4,24
+4,4,234~4,4,237
+7,6,50~8,6,50
+7,0,218~7,1,218
+2,9,114~4,9,114
+6,3,135~6,6,135
+5,3,130~8,3,130
+2,3,237~4,3,237
+0,0,218~0,1,218
+3,7,119~5,7,119
+0,6,189~0,7,189
+4,7,310~4,7,312
+1,8,202~1,9,202
+7,4,153~7,5,153
+7,1,172~9,1,172
+5,5,270~6,5,270
+1,2,239~1,4,239
+2,4,130~2,4,132
+9,6,145~9,7,145
+0,0,214~0,2,214
+5,1,190~8,1,190
diff --git a/src/holt59/aoc/inputs/tests/2023/day22.txt b/src/holt59/aoc/inputs/tests/2023/day22.txt
index e69de29..43a7fc5 100644
--- a/src/holt59/aoc/inputs/tests/2023/day22.txt
+++ b/src/holt59/aoc/inputs/tests/2023/day22.txt
@@ -0,0 +1,7 @@
+1,0,1~1,2,1
+0,0,2~2,0,2
+0,2,3~2,2,3
+0,0,4~0,2,4
+2,0,5~2,2,5
+0,1,6~2,1,6
+1,1,8~1,1,9