GraphBase samples generated by test_sample:

"raman(31,3,3,4)"
12 vertices, 96 arcs, util_types ZZZIIIIZZZZZZZ
V4: "(1,0;1,1)"[1][0][1]
   ->"(1,2;1,0)"[1][2][0], 1[16]
   ->"(1,1;1,2)"[1][1][2], 1[17]
   ->"(0,2;1,0)"[0][2][0], 1[18]
   ->"(1,1;0,1)"[1][1][3], 1[19]
   ->"(2,0;1,2)"[2][0][2], 1[20]
   ->"(1,0;0,1)"[1][0][3], 1[21]
   ->"(0,2;1,1)"[0][2][1], 1[22]
   ->"(2,1;1,1)"[2][1][1], 1[23]

"board(1,1,2,-33,1,-2147483648,1)"
2048 vertices, 14336 arcs, util_types ZZZIIIZZZZZZZZ
V2000: "0.0.1.0.0.1.0.0.1.0.0.1.0.0.1.0.0.0.0.0.1.0.0.0.0.0.0.0.0.0.0.0.0"[0][0][1]
   ->"0.0.1.0.0.1.0.0.1.0.0.1.0.0.1.0.0.1.0.0.1.0.0.0.0.0.0.0.0.0.0.0.0"[0][0][1], 1
   ->"0.0.1.0.0.1.0.0.1.0.0.1.0.0.1.0.0.0.0.0.1.0.0.1.0.0.0.0.0.0.0.0.0"[0][0][1], 1
   ->"0.0.1.0.0.1.0.0.1.0.0.1.0.0.1.0.0.0.0.0.1.0.0.0.0.0.1.0.0.0.0.0.0"[0][0][1], 1
   ->"0.0.1.0.0.1.0.0.1.0.0.1.0.0.1.0.0.0.0.0.1.0.0.0.0.0.0.0.0.1.0.0.0"[0][0][1], 1
   ->"0.0.1.0.0.1.0.0.1.0.0.1.0.0.1.0.0.0.0.0.1.0.0.0.0.0.0.0.0.0.0.0.0"[0][0][1], 1
   ->"0.0.1.0.0.1.0.0.1.0.0.1.0.0.1.0.0.0.0.0.1.0.0.0.0.0.0.0.0.0.0.0.1"[0][0][1], 1

"subsets(32,18,16,0,0,0,0x80000000,1)"
3 vertices, 2 arcs, util_types ZZZIIIZZZZZZZZ
V1: "17.15"[17][15][0]
   ->"18.14"[18][14][0], 1

"gunion(random_lengths(complement(random_graph(3,10,1,1,0,0,dist,1,2,1),1,1,0),0,10,12,dist,2),random_graph(3,10,1,1,0,0,dist,1,2,1),1,0)"
3 vertices, 30 arcs, util_types ZZZZZZZZZZZZZZ
V2: "2"
   ->"1", 1
   ->"1", 2
   ->"1", 2
   ->"1", 10
   ->"0", 2
   ->"0", 11

"partial_gates(risc(16),1,43210,98765)"
1702 vertices, 3796 arcs, util_types ZZZIIVZZZZZZZA[->"Z1508"[0][38]]
V79: "R10:10"[0][76]["Z898"[0][38]]

"book("homer",500,400,2,12,10000,-123456,789)"
100 vertices, 4 arcs, util_types IZZIISIZZZZZZZ
V81: "Eetion"[90][2][1]["king of Cilicia, father of AH"]
   ->"Andromache"[377][2][1]["wife of HT"], 1[6]

"econ(40,0,400,-111)"
40 vertices, 512 arcs, util_types ZZZZIAIZZZZZZZ
V11: "Printing and publishing"[69451][->NULL]
   ->"Food, liquor, and candy"[300724], 1[1863]
   ->"Cigarettes, cigars, tobacco"[24445], 1[195]
   ->"Printing and publishing"[69451], 1[6089]
   ->"Business support services"[463594], 1[8369]
   ->"Personal services"[827615], 1[9073]
   ->"Users"[3999362], 1[30676]

"games(60,70,80,-90,-101,60,128,999999999)"
60 vertices, 114 arcs, util_types IIZSSSIIZZZZZZ
V14: "Maryland"[2752512][131072]["MD"]["Terps"]["Atlantic Coast"]
   ->"Louisiana Tech"[0][0]["LTECH"]["Bulldogs"]["(null)"], 34[2][111]
   ->"Virginia"[65863868][17825857]["VA"]["Cavaliers"]["Atlantic Coast"], 35[1][83]

"miles(50,-500,100,1,500,5,314159)"
50 vertices, 164 arcs, util_types ZZIIIIZZZZZZZZ
V20: "Saint Louis, MO"[453085][3293][1785][24]
   ->"Tupelo, MS"[23905][3441][1131][86], 364
   ->"Springfield, MO"[133116][2983][1575][62], 235

"plane_lisa(100,100,50,1,300,1,200,2975050,11900200)"
2452 vertices, 10814 arcs, util_types ZZZIIIZZIIZZZZ[100][100]
V1294: "1294"[11][2407][2408]
   ->"1295"[12][2409][2409], 1
   ->"1256"[8][2308][2308], 1
   ->"1293"[10][2406][2508], 1
   ->"1255"[10][2307][2307], 1

"plane_miles(50,500,-100,1,1,40000,271818)"
51 vertices, 96 arcs, util_types ZZIIIIZZZZZZZZ
V14: "Saint Louis, MO"[453085][3293][1785][24]
   ->"Waterloo, IA"[75985][3078][2367][103], 373
   ->"South Bend, IN"[109727][3687][2244][58], 358
   ->"San Diego, CA"[875538][597][898][35], 1875

"random_bigraph(300,3,1000,-1,0,dist,-500,500,666)"
303 vertices, 1138 arcs, util_types ZZZZZZZZIZZZZZ[300]
V3: "3"
   ->"300", -386
   ->"302", 180

"roget(1000,3,1009,1009)"
1000 vertices, 3573 arcs, util_types IZZZZZZZZZZZZZ
V40: "thought"[461]
   ->"imagination"[527], 1
   ->"memory"[517], 1
   ->"inquiry"[471], 1
   ->"inattention"[468], 1
   ->"attention"[467], 1

Ooops, we just ran into panic code 30!

"words(90,{100,-80588,50000,18935,-18935,18935,18935,18935,18935},70000000,69)"
90 vertices, 38 arcs, util_types IZZZZZIZZZZZZZ
V5: "would"[590131605]
   ->"world"[150515830], 1[2]
   ->"could"[438944820], 1[0]

"words(5757,0,0,69)"
5757 vertices, 28270 arcs, util_types IZZZZZIZZZZZZZ
V5555: "laded"[0]
   ->"lades"[0], 1[4]
   ->"laden"[204], 1[4]
   ->"laved"[0], 1[2]
   ->"lased"[0], 1[2]
   ->"lazed"[2], 1[2]
   ->"lamed"[112], 1[2]
   ->"laced"[168], 1[2]
   ->"jaded"[110], 1[0]
   ->"waded"[240], 1[0]
   ->"faded"[430], 1[0]