diff --git a/day04/input b/day04/input
new file mode 100644
index 0000000..b916015
--- /dev/null
+++ b/day04/input
@@ -0,0 +1,1000 @@
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+60-81,19-60
+2-90,2-89
+1-3,5-44
+5-99,8-96
+7-7,8-8
+27-39,28-80
+6-89,4-5
+44-66,11-67
+15-88,7-99
+5-44,5-6
+70-95,71-94
+2-2,2-81
+99-99,4-99
+98-99,22-98
+69-78,65-77
+46-51,45-51
+34-67,66-68
+36-74,35-75
+38-63,39-62
+22-72,39-73
+15-52,16-52
+19-98,19-97
+4-99,3-3
+2-2,3-96
+3-85,4-4
+19-91,10-20
+4-20,20-78
+2-56,6-85
+6-54,5-54
+4-65,5-65
+13-74,15-74
+78-92,79-94
+68-77,62-76
+5-75,5-75
+68-85,69-88
+62-94,21-94
+6-94,5-95
+1-3,3-61
+37-68,37-69
+4-4,5-65
+96-97,3-97
+8-96,7-7
+69-96,8-91
+87-88,8-88
+17-32,74-91
+13-93,13-93
+44-46,21-45
+37-49,49-50
+9-53,53-90
+43-51,49-49
+5-91,6-92
+12-77,12-13
+29-94,30-32
+77-78,53-77
+10-62,26-83
+44-46,45-60
+79-90,79-97
+5-89,89-89
+3-64,2-65
+58-96,73-96
+49-97,16-96
+27-49,26-50
+25-51,51-71
+45-48,46-51
+80-81,3-80
+26-30,25-25
+94-95,50-94
+65-95,63-94
+11-95,3-44
+11-97,10-10
+97-98,2-97
+46-50,53-66
+7-23,22-97
+55-85,55-85
+85-92,11-85
+98-99,5-99
+60-61,4-61
+30-31,8-30
+53-54,38-53
+2-3,4-5
+3-99,2-99
+19-85,21-66
+36-53,36-50
+70-71,24-70
+19-85,20-85
+1-84,15-86
+30-57,30-58
+78-81,77-82
+19-26,26-27
+52-73,51-72
+73-89,69-88
+2-5,4-79
+9-35,10-34
+4-60,3-61
+5-5,4-69
+98-99,16-98
+57-85,85-86
+1-81,2-80
+44-73,44-73
+90-97,68-90
+75-88,1-75
+95-98,12-95
+40-66,39-67
+3-99,4-26
+52-76,93-99
+16-30,30-66
+68-69,68-69
+19-68,9-19
+37-90,37-41
+1-94,94-94
+2-2,1-83
+12-93,2-12
+27-96,17-28
+44-46,36-67
+72-90,73-89
+20-29,21-21
+7-59,59-60
+69-74,66-74
+27-82,69-83
+12-78,12-78
+13-64,63-70
+41-60,40-40
+32-96,59-97
+1-98,1-97
+9-64,8-19
+4-4,3-97
+8-96,8-9
+5-5,4-68
+44-68,45-45
+42-67,41-71
+49-50,18-49
+1-95,83-91
+7-8,7-82
+31-76,32-75
+45-63,54-64
+92-93,84-92
+94-96,95-97
+21-61,20-62
+13-67,5-42
+15-58,16-84
+47-55,29-46
+56-65,55-57
+11-53,12-52
+1-48,48-57
+20-75,15-75
+1-95,21-95
+2-39,3-90
+4-54,24-55
+8-42,41-46
+9-97,9-98
+45-83,39-82
+23-72,22-71
+68-68,62-68
+2-96,1-1
+15-90,16-91
+25-27,26-93
+34-36,30-35
+2-65,3-64
+2-54,53-54
+39-84,38-84
+9-96,10-96
+79-80,70-76
+22-47,31-47
+13-87,12-87
+87-93,87-94
+24-44,25-94
+36-93,6-97
+8-94,28-41
+50-61,56-62
+32-74,74-75
+3-78,13-78
+99-99,23-87
+25-83,25-83
+15-15,14-20
+62-63,32-63
+36-49,35-57
+48-93,14-49
+52-71,51-53
+1-2,1-11
+22-99,98-99
+28-29,28-49
+7-8,7-81
+27-64,64-93
+13-59,14-60
+12-88,10-11
+13-79,14-50
+2-3,5-87
+18-77,18-76
diff --git a/day04/input.ivy b/day04/input.ivy
new file mode 100644
index 0000000..91dec19
--- /dev/null
+++ b/day04/input.ivy
@@ -0,0 +1 @@
+input = 1000 4 rho 24 66 23 25 3 3 2 80 14 80 13 20 39 78 40 40 36 90 89 90 51 94 50 50 10 72 10 98 54 81 2 90 27 84 27 85 21 57 21 57 6 55 4 5 80 87 87 90 23 71 22 90 24 37 2 36 79 91 78 91 75 92 91 93 23 80 23 81 67 94 68 94 79 85 79 81 40 88 39 89 15 75 14 76 18 77 34 78 2 99 4 93 1 74 15 75 39 82 39 81 19 91 18 84 56 87 57 86 15 72 14 71 37 88 36 87 21 24 18 23 34 83 34 34 20 95 94 95 27 75 26 80 91 93 27 92 55 66 56 62 29 31 30 89 85 95 89 99 1 2 1 3 63 64 13 64 66 95 30 86 2 73 3 74 25 99 6 25 10 28 28 87 10 42 9 43 12 46 46 75 91 97 91 96 46 59 46 59 34 35 5 34 27 93 93 93 4 12 21 97 7 65 5 8 42 63 2 62 70 76 64 75 1 95 1 94 12 30 13 30 3 99 2 99 46 60 58 60 1 94 93 98 7 98 8 98 7 51 8 81 39 84 40 85 43 84 8 84 10 93 11 93 3 63 2 47 18 87 18 18 77 96 95 97 2 99 1 99 3 45 2 45 19 99 8 97 7 98 8 60 3 94 2 2 51 71 21 51 28 98 10 27 13 96 13 97 4 99 1 1 3 93 93 97 13 13 14 98 16 38 17 17 16 46 16 46 7 63 4 8 18 85 13 19 17 21 18 21 7 74 8 73 5 77 4 6 11 18 1 18 3 25 4 4 2 96 2 93 19 38 18 39 11 45 10 10 20 20 21 83 2 97 97 97 81 81 2 80 5 82 58 59 47 51 4 47 89 93 40 89 19 29 18 84 18 36 16 18 41 55 47 47 6 34 7 33 5 82 6 81 6 19 18 27 42 55 43 55 1 99 2 71 45 94 45 45 2 88 1 88 15 35 14 36 17 36 10 25 20 96 84 98 81 87 81 81 85 87 85 86 34 74 73 74 17 97 16 98 11 50 12 51 2 99 3 3 79 90 79 91 89 99 1 89 87 93 72 93 31 52 30 96 75 84 45 83 81 96 81 96 84 85 24 85 36 60 35 36 11 91 10 91 18 19 19 62 50 52 50 54 59 86 52 86 61 65 70 70 28 96 58 99 10 46 46 46 10 10 10 25 17 72 18 18 58 77 34 59 3 5 5 34 14 14 14 83 5 88 6 14 2 70 3 69 42 79 48 80 26 48 26 27 15 84 14 85 82 83 33 76 14 34 5 33 27 76 26 26 3 88 2 2 19 58 20 57 26 79 25 89 94 95 13 94 35 77 35 78 63 99 69 99 18 26 27 99 1 76 76 77 37 44 22 44 3 64 3 89 54 86 55 85 92 92 92 95 26 38 26 38 62 81 19 80 20 63 8 65 46 79 46 80 35 71 70 72 12 81 11 11 34 69 18 77 1 84 2 2 19 24 18 21 8 90 89 91 12 64 64 65 18 97 17 19 93 93 5 93 34 46 34 46 14 82 13 81 32 46 46 47 1 8 9 97 3 4 3 54 85 87 69 86 12 90 12 91 7 11 10 33 19 34 18 24 36 63 26 62 4 98 6 98 80 96 80 81 10 11 10 34 21 69 8 70 6 80 5 81 14 92 3 15 23 40 16 39 8 66 20 66 12 79 12 13 14 61 15 52 10 29 10 29 36 37 36 89 46 48 18 47 24 98 23 25 81 96 13 81 6 88 1 89 58 76 57 75 56 76 57 75 1 84 1 1 1 20 2 20 38 98 38 99 33 73 32 73 41 95 40 94 29 44 28 44 68 86 67 69 1 66 1 2 12 28 13 90 28 74 19 29 48 51 51 65 11 64 11 64 74 74 66 74 2 5 5 87 69 69 4 69 21 51 51 56 51 83 13 83 12 99 5 6 3 91 4 90 3 55 8 36 12 44 36 45 6 86 5 87 9 18 8 16 13 63 14 57 3 96 4 95 41 87 42 86 44 62 22 48 17 62 46 63 62 63 63 64 31 59 30 60 10 78 9 79 41 97 20 96 18 92 18 92 30 30 30 90 6 80 4 79 46 98 13 36 7 70 7 7 35 46 25 46 77 77 76 76 8 10 9 78 4 98 5 36 37 96 41 96 35 68 34 88 22 69 40 70 13 90 12 89 11 39 12 56 51 82 50 81 47 96 46 73 95 96 2 91 66 95 56 77 84 84 83 85 7 58 8 87 6 83 5 83 23 49 14 48 4 97 5 96 17 18 17 46 15 76 93 99 63 64 63 67 45 46 29 45 29 84 13 84 95 95 95 98 19 91 11 37 14 19 19 94 24 93 75 91 52 79 78 80 3 94 4 93 2 99 2 3 40 96 38 95 23 91 23 91 88 89 66 88 14 92 91 92 14 94 6 94 21 57 36 84 15 97 99 99 2 98 1 99 38 80 38 80 12 93 29 98 19 34 20 42 11 70 10 71 44 95 45 95 53 69 54 68 33 68 10 34 33 35 33 34 3 5 4 66 57 82 56 56 36 54 36 53 14 15 10 15 24 51 38 52 16 76 72 76 56 57 3 57 6 89 5 90 12 45 13 70 36 38 37 88 19 31 25 31 2 2 8 96 5 92 4 69 9 98 8 8 5 14 5 14 46 99 9 46 55 56 2 55 7 95 7 94 45 65 41 65 80 81 4 80 6 47 48 86 25 34 35 75 72 74 71 71 2 94 1 3 31 49 32 49 20 61 19 35 11 86 11 90 52 78 52 53 42 42 18 43 2 2 4 94 8 78 78 78 3 49 2 50 5 74 11 73 17 56 16 72 46 87 47 79 72 80 47 51 11 69 12 12 2 99 3 99 13 27 12 15 23 95 22 96 39 41 40 96 74 98 73 73 82 83 80 82 12 79 11 32 6 58 7 7 3 3 3 97 4 97 24 95 3 80 4 75 72 83 71 84 20 82 21 21 6 73 6 72 77 77 77 97 18 57 57 57 53 76 46 75 21 40 20 74 60 65 55 64 78 78 32 78 22 46 42 46 4 46 3 47 35 39 39 40 79 90 80 89 36 36 37 60 9 28 13 29 15 85 82 85 5 5 4 79 17 86 9 17 6 57 57 57 76 88 76 88 73 79 78 80 52 54 2 53 1 95 6 94 46 91 23 99 70 86 11 71 19 96 18 96 25 42 24 24 32 88 88 94 7 93 8 99 5 21 5 20 34 94 93 94 92 93 15 92 38 84 39 85 79 80 7 79 48 72 72 72 10 92 93 98 14 53 15 92 7 42 7 37 11 88 11 87 41 65 64 65 71 85 11 64 21 79 79 87 80 81 22 81 40 79 39 41 18 67 67 91 11 13 12 61 1 97 96 98 5 66 4 4 1 1 2 75 15 62 16 62 28 56 28 28 3 3 4 79 68 94 3 68 8 92 7 9 69 83 69 84 6 90 22 90 10 20 5 10 21 80 20 21 15 76 14 76 75 75 74 83 5 13 6 22 39 84 83 84 30 43 34 38 42 98 43 97 6 29 5 59 62 80 63 88 5 93 6 6 53 64 54 64 47 47 4 47 62 62 59 62 46 87 46 87 93 95 43 55 4 4 4 19 86 91 48 86 22 45 23 44 13 38 38 93 5 36 4 20 27 27 27 33 10 12 11 83 10 93 3 93 79 80 35 80 64 90 53 68 52 91 47 89 2 66 2 3 58 58 22 57 7 58 5 94 3 11 4 10 32 38 31 39 10 76 21 29 15 42 15 42 9 43 9 95 3 56 4 57 35 68 36 68 55 89 56 88 2 3 2 99 2 97 97 99 29 66 30 65 5 25 4 25 52 87 51 54 28 64 36 66 52 90 51 51 95 96 33 95 1 2 1 82 19 32 20 31 73 75 74 83 73 87 87 88 19 70 70 70 4 93 5 13 96 96 6 95 10 17 10 18 70 73 24 70 25 25 26 76 58 58 10 58 5 83 4 84 45 47 46 74 50 67 66 68 88 89 89 93 15 19 16 24 28 30 2 29 17 19 18 77 21 94 21 83 23 81 81 82 2 91 3 66 75 94 76 94 2 4 3 99 19 82 82 83 3 85 3 3 62 74 45 61 33 33 33 47 66 72 66 72 62 97 61 61 41 74 40 75 7 89 4 7 56 67 55 57 6 25 25 89 11 11 10 14 89 98 16 97 18 76 18 76 23 96 61 97 6 15 16 68 3 99 2 99 22 61 9 22 45 86 44 44 30 46 45 46 55 86 1 97 21 95 20 95 20 47 48 82 15 47 16 80 39 51 39 52 9 15 9 90 1 86 85 86 38 38 38 79 41 41 18 42 7 98 87 98 9 87 60 88 30 87 87 88 10 58 1 6 5 58 5 58 38 76 37 76 9 82 81 82 2 10 5 43 50 51 2 51 35 93 34 93 18 75 17 75 14 59 14 59 27 27 28 88 61 62 46 61 38 74 38 51 49 87 50 50 39 39 38 95 48 98 2 97 27 29 28 92 23 55 22 54 30 31 29 31 11 59 10 58 15 84 59 85 22 57 24 56 17 42 6 42 5 93 92 94 76 89 76 90 1 84 84 85 36 77 13 78 31 78 31 57 23 89 22 90 36 37 36 48 41 84 34 83 6 36 5 6 74 91 45 92 62 99 62 65 3 30 4 98 9 83 9 83 11 93 13 94 7 35 6 6 36 38 37 67 84 93 1 92 28 57 27 56 94 97 95 98 41 74 40 75 7 91 12 88 42 97 43 96 7 13 14 85 58 96 4 98 15 95 47 95 87 90 5 87 35 71 36 71 27 29 29 29 21 28 28 46 2 13 13 99 38 52 39 51 12 79 61 80 59 81 19 59 87 88 15 87 10 53 8 10 4 10 2 9 13 93 69 94 42 61 82 83 9 97 10 10 9 21 8 20 42 89 89 90 4 86 79 87 11 58 11 47 83 84 14 84 5 75 32 75 45 97 97 97 39 39 38 48 44 44 43 58 50 69 49 68 61 87 55 86 4 95 94 95 47 48 47 48 40 67 39 39 15 68 15 69 4 84 4 84 98 99 1 99 3 8 8 98 2 97 3 97 20 46 46 90 25 64 43 83 26 47 26 47 27 28 1 28 50 52 51 64 76 87 91 99 39 60 38 40 3 99 4 99 67 82 10 67 45 76 46 59 16 79 15 78 11 63 19 62 9 54 10 55 4 95 96 96 16 87 15 88 9 30 29 88 68 69 10 68 51 54 52 74 2 4 4 59 1 96 97 99 17 90 54 91 25 27 26 88 95 97 57 95 25 33 25 25 33 64 33 47 32 93 33 93 3 37 37 38 60 80 54 79 38 39 21 39 9 94 94 96 27 80 27 81 1 74 22 75 11 89 11 89 7 81 82 98 5 56 56 75 3 3 3 90 18 62 18 19 28 99 29 98 2 2 2 75 31 86 12 65 71 72 20 71 73 73 56 72 94 98 7 88 91 91 92 92 3 98 4 97 2 71 70 71 5 63 63 63 39 81 21 81 44 44 44 78 64 88 15 87 95 95 92 96 17 32 32 94 11 81 12 82 86 97 85 98 92 99 8 98 22 70 23 23 11 97 10 11 72 73 61 72 25 58 24 98 52 65 53 55 66 67 1 66 8 65 53 65 83 98 82 89 33 79 33 79 65 79 65 92 7 34 8 53 27 43 34 73 28 77 28 77 59 96 27 98 7 55 19 66 2 78 3 79 13 13 12 81 2 92 91 92 2 44 1 43 32 33 32 99 92 93 20 93 97 98 8 98 15 60 16 60 3 98 2 99 37 37 13 37 9 82 82 97 23 86 22 67 18 35 9 27 57 73 57 58 36 93 36 37 15 15 15 77 52 82 51 73 13 22 14 96 9 67 8 68 6 76 7 83 1 4 1 4 1 95 1 90 25 29 29 80 77 91 39 90 7 97 8 96 45 77 46 88 20 59 59 82 64 64 63 96 31 83 32 32 11 96 96 97 59 77 59 59 47 75 47 65 8 95 2 8 19 81 19 81 35 36 36 37 83 84 83 90 4 97 2 49 39 96 38 97 64 99 6 86 29 95 29 96 27 84 7 27 4 63 6 62 60 66 61 66 58 91 90 91 44 65 62 69 13 24 23 61 45 88 88 93 62 95 95 96 1 86 1 85 33 33 12 33 36 67 37 66 11 49 48 50 4 76 1 4 5 84 4 53 22 65 22 65 12 22 13 64 16 16 16 33 10 97 44 98 47 52 48 64 58 95 59 99 18 71 37 72 7 79 8 79 2 61 3 98 67 84 83 85 56 86 82 85 22 97 28 98 42 57 41 57 23 26 11 25 45 82 5 81 41 43 42 79 3 93 93 93 60 87 59 84 93 99 44 93 47 95 74 95 51 52 40 52 11 32 12 84 4 89 1 4 3 93 93 94 97 97 17 96 12 67 11 11 25 80 39 60 98 99 3 98 61 62 60 62 24 35 34 35 10 86 11 87 64 66 4 90 1 1 2 89 15 75 46 76 71 72 17 72 7 9 8 91 18 36 18 70 3 5 4 16 8 88 7 88 69 85 69 69 17 46 18 47 8 37 37 50 2 38 1 39 99 99 9 99 30 78 31 89 51 64 52 63 11 99 1 99 81 82 23 81 54 62 53 53 80 91 24 80 96 98 75 97 78 78 46 78 7 88 7 89 1 22 1 22 5 39 5 38 95 95 13 96 19 49 17 85 7 96 6 96 29 93 49 75 42 76 43 75 62 62 61 70 36 42 37 46 5 84 91 92 26 95 25 27 36 81 63 82 17 51 18 50 34 74 34 75 6 53 53 86 28 28 28 36 6 6 6 77 42 70 41 70 29 92 92 93 10 50 9 51 90 93 80 90 3 84 28 97 3 3 2 74 9 92 8 10 58 70 58 70 1 61 2 16 29 85 29 69 61 96 31 96 30 81 12 30 25 72 24 26 60 96 60 96 2 29 2 28 27 57 26 57 5 94 2 99 5 15 4 19 2 46 3 29 39 60 38 99 1 2 1 83 17 86 18 87 68 95 69 94 31 52 8 53 80 89 81 88 17 57 16 56 7 28 6 24 35 63 63 63 42 89 88 89 97 98 71 98 79 82 6 68 8 34 34 34 66 71 38 70 15 65 66 71 22 82 21 83 9 81 10 22 19 85 18 86 19 19 20 70 6 76 45 76 1 37 36 55 49 98 98 98 9 88 4 10 74 83 17 82 30 63 22 62 8 89 4 8 3 87 2 16 91 91 49 91 2 53 53 97 9 14 13 71 33 98 34 99 31 58 27 59 22 34 34 34 3 5 4 97 36 93 25 31 50 62 35 61 43 84 43 83 60 81 19 60 2 90 2 89 1 3 5 44 5 99 8 96 7 7 8 8 27 39 28 80 6 89 4 5 44 66 11 67 15 88 7 99 5 44 5 6 70 95 71 94 2 2 2 81 99 99 4 99 98 99 22 98 69 78 65 77 46 51 45 51 34 67 66 68 36 74 35 75 38 63 39 62 22 72 39 73 15 52 16 52 19 98 19 97 4 99 3 3 2 2 3 96 3 85 4 4 19 91 10 20 4 20 20 78 2 56 6 85 6 54 5 54 4 65 5 65 13 74 15 74 78 92 79 94 68 77 62 76 5 75 5 75 68 85 69 88 62 94 21 94 6 94 5 95 1 3 3 61 37 68 37 69 4 4 5 65 96 97 3 97 8 96 7 7 69 96 8 91 87 88 8 88 17 32 74 91 13 93 13 93 44 46 21 45 37 49 49 50 9 53 53 90 43 51 49 49 5 91 6 92 12 77 12 13 29 94 30 32 77 78 53 77 10 62 26 83 44 46 45 60 79 90 79 97 5 89 89 89 3 64 2 65 58 96 73 96 49 97 16 96 27 49 26 50 25 51 51 71 45 48 46 51 80 81 3 80 26 30 25 25 94 95 50 94 65 95 63 94 11 95 3 44 11 97 10 10 97 98 2 97 46 50 53 66 7 23 22 97 55 85 55 85 85 92 11 85 98 99 5 99 60 61 4 61 30 31 8 30 53 54 38 53 2 3 4 5 3 99 2 99 19 85 21 66 36 53 36 50 70 71 24 70 19 85 20 85 1 84 15 86 30 57 30 58 78 81 77 82 19 26 26 27 52 73 51 72 73 89 69 88 2 5 4 79 9 35 10 34 4 60 3 61 5 5 4 69 98 99 16 98 57 85 85 86 1 81 2 80 44 73 44 73 90 97 68 90 75 88 1 75 95 98 12 95 40 66 39 67 3 99 4 26 52 76 93 99 16 30 30 66 68 69 68 69 19 68 9 19 37 90 37 41 1 94 94 94 2 2 1 83 12 93 2 12 27 96 17 28 44 46 36 67 72 90 73 89 20 29 21 21 7 59 59 60 69 74 66 74 27 82 69 83 12 78 12 78 13 64 63 70 41 60 40 40 32 96 59 97 1 98 1 97 9 64 8 19 4 4 3 97 8 96 8 9 5 5 4 68 44 68 45 45 42 67 41 71 49 50 18 49 1 95 83 91 7 8 7 82 31 76 32 75 45 63 54 64 92 93 84 92 94 96 95 97 21 61 20 62 13 67 5 42 15 58 16 84 47 55 29 46 56 65 55 57 11 53 12 52 1 48 48 57 20 75 15 75 1 95 21 95 2 39 3 90 4 54 24 55 8 42 41 46 9 97 9 98 45 83 39 82 23 72 22 71 68 68 62 68 2 96 1 1 15 90 16 91 25 27 26 93 34 36 30 35 2 65 3 64 2 54 53 54 39 84 38 84 9 96 10 96 79 80 70 76 22 47 31 47 13 87 12 87 87 93 87 94 24 44 25 94 36 93 6 97 8 94 28 41 50 61 56 62 32 74 74 75 3 78 13 78 99 99 23 87 25 83 25 83 15 15 14 20 62 63 32 63 36 49 35 57 48 93 14 49 52 71 51 53 1 2 1 11 22 99 98 99 28 29 28 49 7 8 7 81 27 64 64 93 13 59 14 60 12 88 10 11 13 79 14 50 2 3 5 87 18 77 18 76
\ No newline at end of file
diff --git a/day04/sol.ivy b/day04/sol.ivy
new file mode 100644
index 0000000..a4488df
--- /dev/null
+++ b/day04/sol.ivy
@@ -0,0 +1,20 @@
+
+sample = 6 4 rho 2 4 6 8   2 3 4 5   5 7 7 9   2 8 3 7   6 6 4 6   2 6 4 8
+) get "input.ivy"
+
+op r overlaps s = not (r[2] < s[1]) or (s[2] < r[1])
+op r contains s = (r[1] <= s[1]) and (s[2] <= r[2])
+
+op contains x = (x[1 2] contains x[3 4]) or (x[3 4] contains x[1 2])
+op overlaps x = (x[1 2] overlaps x[3 4])
+
+#1 3 overlaps 4 5
+#1 5 overlaps 2 7
+#contains 1 2 3 4
+#contains 5 10 7 8
+
++/ contains transp sample
++/ contains transp input
+
++/ overlaps transp sample
++/ overlaps transp input
diff --git a/day04/toivy.py b/day04/toivy.py
new file mode 100755
index 0000000..35cc3b7
--- /dev/null
+++ b/day04/toivy.py
@@ -0,0 +1,34 @@
+#!/usr/bin/env python3
+
+"""
+Converts a text file containing a list of integers
+into a format that can be loaded by ivy.
+"""
+
+with open("input") as f:
+    lines = f.read().splitlines()
+
+data = []
+for line in lines:
+    line = line.replace("-", ",")
+    data.append(line.split(","))
+
+def count(row):
+    n = 0
+    for x in row:
+        if x.isdigit():
+            n += 1
+        else:
+            n += len(x)
+    return n
+        
+cols = max(map(count, data))
+
+print("input = {} {} rho".format(len(data), cols), end="")
+for row in data:
+    print("", " ".join(
+        x if x.isdigit() else repr(x)
+        for x in row), end="")
+    n = count(row)
+    if n < cols:
+        print(" 0" * (cols - n), end="")