{ "metadata": { "title": "FanPedia: An Intelligent Textbook on Fans & Blowers", "description": "A learning graph for an intelligent textbook on industrial and commercial fans and blowers: fan families, anatomy, arrangements, impellers, rotation and discharge, motors, bearings, inlets and outlets, flow control, special construction, installation, performance, and reading catalogs to write fan specifications. Built from Twin City Fan's FanPedia and current tcf.com catalogs.", "creator": "Twin City Fan", "date": "2026-10-08", "version": "1.0", "format": "Learning Graph JSON v1.0", "schema": "https://raw.githubusercontent.com/dmccreary/learning-graphs/refs/heads/main/src/schema/learning-graph-schema.json", "license": "Copyright 2026 Twin City Fan. All rights reserved." }, "groups": { "FOUND": { "classifierName": "Air and Fan Fundamentals", "color": "SteelBlue", "font": { "color": "white" } }, "FAM": { "classifierName": "Fan Families and Product Lines", "color": "DarkGreen", "font": { "color": "white" } }, "ANAT": { "classifierName": "Fan Anatomy and Housings", "color": "Gold", "font": { "color": "black" } }, "IMP": { "classifierName": "Impellers and Hubs", "color": "DodgerBlue", "font": { "color": "white" } }, "ARR": { "classifierName": "Arrangements and Drives", "color": "Crimson", "font": { "color": "white" } }, "ROT": { "classifierName": "Rotation, Discharge and Motor Position", "color": "MediumPurple", "font": { "color": "white" } }, "MOT": { "classifierName": "Motors and Motor Mounting", "color": "Teal", "font": { "color": "white" } }, "BRG": { "classifierName": "Bearings, Shafts and Seals", "color": "DarkGoldenrod", "font": { "color": "white" } }, "INOUT": { "classifierName": "Inlets, Outlets and Flow Control", "color": "LightSkyBlue", "font": { "color": "black" } }, "SPEC": { "classifierName": "Special Construction", "color": "DarkRed", "font": { "color": "white" } }, "INST": { "classifierName": "Bases, Isolation and Installation", "color": "OliveDrab", "font": { "color": "white" } }, "PERF": { "classifierName": "Fan Performance", "color": "Orange", "font": { "color": "black" } }, "CAT": { "classifierName": "Catalogs, Selection and Specification", "color": "DarkOrchid", "font": { "color": "white" } } }, "nodes": [ { "id": 1, "label": "Air Movement", "group": "FOUND", "shape": "box", "cis": 13733 }, { "id": 2, "label": "Fan Speed", "group": "FOUND", "shape": "box", "cis": 11322 }, { "id": 3, "label": "Horsepower", "group": "FOUND", "shape": "box", "cis": 2706 }, { "id": 4, "label": "Airflow Volume", "group": "FOUND", "cis": 1382 }, { "id": 5, "label": "Cubic Feet Per Minute", "group": "FOUND", "cis": 59 }, { "id": 6, "label": "Air Velocity", "group": "FOUND", "cis": 103 }, { "id": 7, "label": "Feet Per Minute", "group": "FOUND", "cis": 3 }, { "id": 8, "label": "Air Pressure", "group": "FOUND", "cis": 1283 }, { "id": 9, "label": "Inches of Water Gauge", "group": "FOUND", "cis": 59 }, { "id": 10, "label": "Static Pressure", "group": "FOUND", "cis": 1101 }, { "id": 11, "label": "Velocity Pressure", "group": "FOUND", "cis": 85 }, { "id": 12, "label": "Total Pressure", "group": "FOUND", "cis": 62 }, { "id": 13, "label": "Air Density", "group": "FOUND", "cis": 374 }, { "id": 14, "label": "Air Temperature", "group": "FOUND", "cis": 200 }, { "id": 15, "label": "Altitude", "group": "FOUND", "cis": 107 }, { "id": 16, "label": "Standard Air", "group": "FOUND", "cis": 66 }, { "id": 17, "label": "Airstream", "group": "FOUND", "cis": 371 }, { "id": 18, "label": "Contaminated Airstream", "group": "FOUND", "cis": 194 }, { "id": 19, "label": "Corrosive Airstream", "group": "FOUND", "cis": 46 }, { "id": 20, "label": "Particulate-Laden Airstream", "group": "FOUND", "cis": 26 }, { "id": 21, "label": "Hot Airstream", "group": "FOUND", "cis": 120 }, { "id": 22, "label": "Wet Airstream", "group": "FOUND", "cis": 35 }, { "id": 23, "label": "Explosive Atmosphere", "group": "FOUND", "cis": 77 }, { "id": 24, "label": "Duct System", "group": "FOUND", "cis": 235 }, { "id": 25, "label": "Fan", "group": "FOUND", "cis": 10322 }, { "id": 26, "label": "Blower", "group": "FOUND", "cis": 6 }, { "id": 27, "label": "Fan Housing", "group": "ANAT", "cis": 1194 }, { "id": 28, "label": "Impeller", "group": "ANAT", "cis": 5562 }, { "id": 29, "label": "Fan Inlet", "group": "ANAT", "cis": 147 }, { "id": 30, "label": "Fan Outlet", "group": "ANAT", "cis": 303 }, { "id": 31, "label": "Fan Shaft", "group": "ANAT", "cis": 2742 }, { "id": 32, "label": "Bearing", "group": "ANAT", "cis": 1755 }, { "id": 33, "label": "Fan Motor", "group": "ANAT", "cis": 2380 }, { "id": 34, "label": "Drive Train", "group": "ANAT", "cis": 725 }, { "id": 35, "label": "Fan Family", "group": "FAM", "cis": 1085 }, { "id": 36, "label": "Centrifugal Fan", "group": "FAM", "cis": 562 }, { "id": 37, "label": "Axial Fan", "group": "FAM", "cis": 134 }, { "id": 38, "label": "Mixed Flow Fan", "group": "FAM", "cis": 4 }, { "id": 39, "label": "Scroll Housing", "group": "ANAT", "cis": 263 }, { "id": 40, "label": "Housed Centrifugal Fan", "group": "FAM", "cis": 91 }, { "id": 41, "label": "Unhoused Centrifugal Fan", "group": "FAM", "cis": 80 }, { "id": 42, "label": "Plenum Fan", "group": "FAM", "cis": 79 }, { "id": 43, "label": "Plug Fan", "group": "FAM", "cis": 72 }, { "id": 44, "label": "Inline Centrifugal Fan", "group": "FAM", "cis": 25 }, { "id": 45, "label": "Square Inline Centrifugal Fan", "group": "FAM", "cis": 2 }, { "id": 46, "label": "Tubular Housing", "group": "ANAT", "cis": 32 }, { "id": 47, "label": "Tubeaxial Fan", "group": "FAM", "cis": 28 }, { "id": 48, "label": "Guide Vanes", "group": "ANAT", "cis": 25 }, { "id": 49, "label": "Vaneaxial Fan", "group": "FAM", "cis": 22 }, { "id": 50, "label": "Panel Fan", "group": "FAM", "cis": 2 }, { "id": 51, "label": "Ring Fan", "group": "FAM", "cis": 1 }, { "id": 52, "label": "Pressure Blower", "group": "FAM", "cis": 5 }, { "id": 53, "label": "Radial Bladed Fan", "group": "FAM", "cis": 14 }, { "id": 54, "label": "Radial Tip Fan", "group": "FAM", "cis": 22 }, { "id": 55, "label": "Duct Fan", "group": "FAM", "cis": 22 }, { "id": 56, "label": "Filtered Supply Fan", "group": "FAM", "cis": 1 }, { "id": 57, "label": "Power Roof Ventilator", "group": "FAM", "cis": 30 }, { "id": 58, "label": "Roof Ventilator", "group": "FAM", "cis": 4 }, { "id": 59, "label": "Centrifugal Roof Exhauster", "group": "FAM", "cis": 6 }, { "id": 60, "label": "Centrifugal Wall Exhauster", "group": "FAM", "cis": 1 }, { "id": 61, "label": "Roof Mounted Axial Fan", "group": "FAM", "cis": 1 }, { "id": 62, "label": "Wall Mounted Fan", "group": "FAM", "cis": 1 }, { "id": 63, "label": "Gravity Relief Ventilator", "group": "FAM", "cis": 1 }, { "id": 64, "label": "Ceiling Ventilator", "group": "FAM", "cis": 2 }, { "id": 65, "label": "Cabinet Ventilator", "group": "FAM", "cis": 1 }, { "id": 66, "label": "Utility Set", "group": "FAM", "cis": 22 }, { "id": 67, "label": "Laboratory Fume Exhaust Fan", "group": "FAM", "cis": 35 }, { "id": 68, "label": "Kitchen Exhaust Fan", "group": "FAM", "cis": 3 }, { "id": 69, "label": "Smoke and Heat Exhaust Fan", "group": "FAM", "cis": 3 }, { "id": 70, "label": "Fiberglass Fan", "group": "FAM", "cis": 3 }, { "id": 71, "label": "Mancooler", "group": "FAM", "cis": 1 }, { "id": 72, "label": "Air Kit", "group": "FAM", "cis": 2 }, { "id": 73, "label": "Commercial Duty Fan", "group": "FAM", "cis": 22 }, { "id": 74, "label": "Industrial Duty Fan", "group": "FAM", "cis": 2 }, { "id": 75, "label": "Upblast Discharge", "group": "FAM", "cis": 3 }, { "id": 76, "label": "Downblast Discharge", "group": "FAM", "cis": 2 }, { "id": 77, "label": "Entrained Flow", "group": "FAM", "cis": 6 }, { "id": 78, "label": "Plume Dilution", "group": "FAM", "cis": 4 }, { "id": 79, "label": "Nozzle and Windband", "group": "ANAT", "cis": 1 }, { "id": 80, "label": "Bypass Air Plenum", "group": "ANAT", "cis": 4 }, { "id": 81, "label": "Exploded View", "group": "ANAT", "cis": 3 }, { "id": 82, "label": "Housing Side Plate", "group": "ANAT", "cis": 3 }, { "id": 83, "label": "Scroll Wrapper", "group": "ANAT", "cis": 1 }, { "id": 84, "label": "Cutoff", "group": "ANAT", "cis": 2 }, { "id": 85, "label": "Inlet Collar", "group": "ANAT", "cis": 3 }, { "id": 86, "label": "Inlet Flange", "group": "ANAT", "cis": 11 }, { "id": 87, "label": "Outlet Flange", "group": "ANAT", "cis": 9 }, { "id": 88, "label": "Access Door", "group": "ANAT", "cis": 18 }, { "id": 89, "label": "Belt Guard", "group": "ANAT", "cis": 2 }, { "id": 90, "label": "Belt Tube", "group": "ANAT", "cis": 1 }, { "id": 91, "label": "Straightening Vanes", "group": "ANAT", "cis": 2 }, { "id": 92, "label": "Welded Housing", "group": "ANAT", "cis": 2 }, { "id": 93, "label": "Bolted Housing", "group": "ANAT", "cis": 1 }, { "id": 94, "label": "Weatherhood", "group": "ANAT", "cis": 4 }, { "id": 95, "label": "Backdraft Damper", "group": "ANAT", "cis": 16 }, { "id": 96, "label": "Bird and Safety Screens", "group": "ANAT", "cis": 16 }, { "id": 97, "label": "Roof Curb", "group": "ANAT", "cis": 2 }, { "id": 98, "label": "Stack Cap", "group": "ANAT", "cis": 3 }, { "id": 99, "label": "Split Housing", "group": "ANAT", "cis": 5 }, { "id": 100, "label": "Horizontal Split Housing", "group": "ANAT", "cis": 1 }, { "id": 101, "label": "Three-Way Split Housing", "group": "ANAT", "cis": 1 }, { "id": 102, "label": "Pie Split Housing", "group": "ANAT", "cis": 1 }, { "id": 103, "label": "Impeller Blade", "group": "IMP", "cis": 26 }, { "id": 104, "label": "Blade Leading Edge", "group": "IMP", "cis": 1 }, { "id": 105, "label": "Impeller Back Plate", "group": "IMP", "cis": 4 }, { "id": 106, "label": "Impeller Shroud", "group": "IMP", "cis": 2 }, { "id": 107, "label": "Impeller Hub", "group": "IMP", "cis": 9 }, { "id": 108, "label": "Centrifugal Impeller", "group": "IMP", "cis": 55 }, { "id": 109, "label": "Single Width Single Inlet", "group": "IMP", "cis": 10 }, { "id": 110, "label": "Double Width Double Inlet", "group": "IMP", "cis": 8 }, { "id": 111, "label": "Backward Inclined Impeller", "group": "IMP", "cis": 13 }, { "id": 112, "label": "Backward Curved Impeller", "group": "IMP", "cis": 4 }, { "id": 113, "label": "Airfoil Impeller", "group": "IMP", "cis": 4 }, { "id": 114, "label": "Forward Curved Impeller", "group": "IMP", "cis": 5 }, { "id": 115, "label": "Radial Bladed Impeller", "group": "IMP", "cis": 13 }, { "id": 116, "label": "Radial Tip Impeller", "group": "IMP", "cis": 3 }, { "id": 117, "label": "Material Handling Impeller", "group": "IMP", "cis": 3 }, { "id": 118, "label": "Paper Handling Impeller", "group": "IMP", "cis": 2 }, { "id": 119, "label": "Mixed Flow Impeller", "group": "IMP", "cis": 2 }, { "id": 120, "label": "Axial Impeller", "group": "IMP", "cis": 17 }, { "id": 121, "label": "Fixed Pitch Impeller", "group": "IMP", "cis": 1 }, { "id": 122, "label": "Adjustable Pitch Impeller", "group": "IMP", "cis": 3 }, { "id": 123, "label": "Fiberglass Axial Impeller", "group": "IMP", "cis": 2 }, { "id": 124, "label": "Impeller Orientation", "group": "IMP", "cis": 5 }, { "id": 125, "label": "Hub on Intake Side", "group": "IMP", "cis": 2 }, { "id": 126, "label": "Hub on Discharge Side", "group": "IMP", "cis": 2 }, { "id": 127, "label": "Reversible Impeller", "group": "IMP", "cis": 1 }, { "id": 128, "label": "Straight Bore Hub", "group": "IMP", "cis": 2 }, { "id": 129, "label": "Taper Lock Hub", "group": "IMP", "cis": 2 }, { "id": 130, "label": "Reverse Bore Hub", "group": "IMP", "cis": 1 }, { "id": 131, "label": "Back Plate Fins", "group": "IMP", "cis": 1 }, { "id": 132, "label": "Impeller Balancing", "group": "IMP", "cis": 47 }, { "id": 133, "label": "Direct Drive", "group": "ARR", "cis": 497 }, { "id": 134, "label": "Belt Drive", "group": "ARR", "cis": 713 }, { "id": 135, "label": "Sheave", "group": "ARR", "cis": 24 }, { "id": 136, "label": "V-Belt", "group": "ARR", "cis": 23 }, { "id": 137, "label": "Drive Service Factor", "group": "ARR", "cis": 23 }, { "id": 138, "label": "Shaft Coupling", "group": "ARR", "cis": 28 }, { "id": 139, "label": "Overhung Impeller", "group": "ARR", "cis": 470 }, { "id": 140, "label": "Center Hung Impeller", "group": "ARR", "cis": 456 }, { "id": 141, "label": "Fan Arrangement", "group": "ARR", "cis": 445 }, { "id": 142, "label": "Arrangement 1", "group": "ARR", "cis": 83 }, { "id": 143, "label": "Arrangement 2", "group": "ARR", "cis": 1 }, { "id": 144, "label": "Arrangement 3", "group": "ARR", "cis": 10 }, { "id": 145, "label": "Arrangement 3 SI and DI", "group": "ARR", "cis": 3 }, { "id": 146, "label": "Arrangement 4", "group": "ARR", "cis": 28 }, { "id": 147, "label": "Arrangement 7", "group": "ARR", "cis": 2 }, { "id": 148, "label": "Arrangement 8", "group": "ARR", "cis": 23 }, { "id": 149, "label": "Arrangement 9", "group": "ARR", "cis": 34 }, { "id": 150, "label": "Arrangement 10", "group": "ARR", "cis": 2 }, { "id": 151, "label": "Plug Fan Arrangements", "group": "ARR", "cis": 68 }, { "id": 152, "label": "Arrangement 1P Plug", "group": "ARR", "cis": 23 }, { "id": 153, "label": "Arrangement 4P Plug", "group": "ARR", "cis": 22 }, { "id": 154, "label": "Plenum Fan Arrangements", "group": "ARR", "cis": 5 }, { "id": 155, "label": "Vertical Arrangement", "group": "ARR", "cis": 3 }, { "id": 156, "label": "Axial and Inline Arrangements", "group": "ARR", "cis": 15 }, { "id": 157, "label": "Lab Exhaust Arrangements", "group": "ARR", "cis": 22 }, { "id": 158, "label": "Swingout Fan", "group": "ARR", "cis": 6 }, { "id": 159, "label": "Clamshell Fan", "group": "ARR", "cis": 3 }, { "id": 160, "label": "Bearings Out of Airstream", "group": "ARR", "cis": 22 }, { "id": 161, "label": "Viewed From Drive Side", "group": "ROT", "cis": 111 }, { "id": 162, "label": "Rotation", "group": "ROT", "cis": 87 }, { "id": 163, "label": "Clockwise Rotation", "group": "ROT", "cis": 24 }, { "id": 164, "label": "Counterclockwise Rotation", "group": "ROT", "cis": 24 }, { "id": 165, "label": "Rotation Arrow", "group": "ROT", "cis": 19 }, { "id": 166, "label": "Discharge Position", "group": "ROT", "cis": 164 }, { "id": 167, "label": "Discharge Angle", "group": "ROT", "cis": 115 }, { "id": 168, "label": "Up Blast Discharge Position", "group": "ROT", "cis": 22 }, { "id": 169, "label": "Top Horizontal Discharge", "group": "ROT", "cis": 22 }, { "id": 170, "label": "Bottom Horizontal Discharge", "group": "ROT", "cis": 22 }, { "id": 171, "label": "Down Blast Discharge Position", "group": "ROT", "cis": 22 }, { "id": 172, "label": "Angular Discharge", "group": "ROT", "cis": 5 }, { "id": 173, "label": "Rotation and Discharge Code", "group": "ROT", "cis": 21 }, { "id": 174, "label": "DWDI Discharge Limits", "group": "ROT", "cis": 2 }, { "id": 175, "label": "Axial Rotation Convention", "group": "ROT", "cis": 2 }, { "id": 176, "label": "Inline Configuration", "group": "ROT", "cis": 5 }, { "id": 177, "label": "Motor Position", "group": "ROT", "cis": 48 }, { "id": 178, "label": "Motor Positions W X Y Z", "group": "ROT", "cis": 20 }, { "id": 179, "label": "Motor Position Restrictions", "group": "ROT", "cis": 19 }, { "id": 180, "label": "Axial Motor Positions", "group": "ROT", "cis": 3 }, { "id": 181, "label": "Plenum Motor Positions", "group": "ROT", "cis": 1 }, { "id": 182, "label": "Conduit Box Position", "group": "ROT", "cis": 19 }, { "id": 183, "label": "Inlet Box Position", "group": "ROT", "cis": 19 }, { "id": 184, "label": "Induction Motor", "group": "MOT", "cis": 71 }, { "id": 185, "label": "EC Motor", "group": "MOT", "cis": 24 }, { "id": 186, "label": "NEMA Frame Size", "group": "MOT", "cis": 5 }, { "id": 187, "label": "Motor Enclosure", "group": "MOT", "cis": 154 }, { "id": 188, "label": "ODP Motor", "group": "MOT", "cis": 25 }, { "id": 189, "label": "TEFC Motor", "group": "MOT", "cis": 25 }, { "id": 190, "label": "TEAO Motor", "group": "MOT", "cis": 1 }, { "id": 191, "label": "TENV Motor", "group": "MOT", "cis": 1 }, { "id": 192, "label": "Explosion Proof Motor", "group": "MOT", "cis": 26 }, { "id": 193, "label": "Motor Service Factor", "group": "MOT", "cis": 51 }, { "id": 194, "label": "Insulation Class", "group": "MOT", "cis": 5 }, { "id": 195, "label": "Motor Efficiency Class", "group": "MOT", "cis": 26 }, { "id": 196, "label": "Conduit Box", "group": "MOT", "cis": 1 }, { "id": 197, "label": "C-Face Motor Mount", "group": "MOT", "cis": 2 }, { "id": 198, "label": "Foot Mounted Motor", "group": "MOT", "cis": 1 }, { "id": 199, "label": "Shaft Grounding Ring", "group": "MOT", "cis": 27 }, { "id": 200, "label": "Motor Winding RTD", "group": "MOT", "cis": 2 }, { "id": 201, "label": "Variable Frequency Drive", "group": "MOT", "cis": 69 }, { "id": 202, "label": "Motor Base", "group": "MOT", "cis": 43 }, { "id": 203, "label": "Slide Base", "group": "MOT", "cis": 6 }, { "id": 204, "label": "Pivot Motor Base", "group": "MOT", "cis": 3 }, { "id": 205, "label": "Motor Positioner", "group": "MOT", "cis": 5 }, { "id": 206, "label": "Bi-Directional Positioner", "group": "MOT", "cis": 1 }, { "id": 207, "label": "Tri-Directional Positioner", "group": "MOT", "cis": 1 }, { "id": 208, "label": "Vertical Jack Screws", "group": "MOT", "cis": 1 }, { "id": 209, "label": "Bearing Life", "group": "BRG", "cis": 3 }, { "id": 210, "label": "L-10 Bearing Life", "group": "BRG", "cis": 2 }, { "id": 211, "label": "L-50 Bearing Life", "group": "BRG", "cis": 1 }, { "id": 212, "label": "Ball Bearing", "group": "BRG", "cis": 2 }, { "id": 213, "label": "Spherical Roller Bearing", "group": "BRG", "cis": 3 }, { "id": 214, "label": "Pillow Block Bearing", "group": "BRG", "cis": 5 }, { "id": 215, "label": "Split Pillow Block Bearing", "group": "BRG", "cis": 2 }, { "id": 216, "label": "Flange Mount Bearing", "group": "BRG", "cis": 1 }, { "id": 217, "label": "Totally Split Roller Bearing", "group": "BRG", "cis": 1 }, { "id": 218, "label": "Two-Bearing Housing", "group": "BRG", "cis": 1 }, { "id": 219, "label": "Set Screw Mount", "group": "BRG", "cis": 3 }, { "id": 220, "label": "Adapter Sleeve Mount", "group": "BRG", "cis": 1 }, { "id": 221, "label": "Fixed Bearing", "group": "BRG", "cis": 6 }, { "id": 222, "label": "Floating Bearing", "group": "BRG", "cis": 5 }, { "id": 223, "label": "Bearing Lubrication", "group": "BRG", "cis": 7 }, { "id": 224, "label": "Grease Fitting", "group": "BRG", "cis": 1 }, { "id": 225, "label": "Static Oil Lubrication", "group": "BRG", "cis": 1 }, { "id": 226, "label": "Oil Mist Lubrication", "group": "BRG", "cis": 1 }, { "id": 227, "label": "Bearing Seal", "group": "BRG", "cis": 6 }, { "id": 228, "label": "Labyrinth Seal", "group": "BRG", "cis": 2 }, { "id": 229, "label": "Taconite Seal", "group": "BRG", "cis": 2 }, { "id": 230, "label": "Bearing Positioner", "group": "BRG", "cis": 4 }, { "id": 231, "label": "Bearing Stop Blocks", "group": "BRG", "cis": 1 }, { "id": 232, "label": "Bearing Dowel Pins", "group": "BRG", "cis": 1 }, { "id": 233, "label": "Bearing Vibration Sensor", "group": "BRG", "cis": 16 }, { "id": 234, "label": "Restrained Bearing", "group": "BRG", "cis": 1 }, { "id": 235, "label": "Shaft Keyway", "group": "BRG", "cis": 2 }, { "id": 236, "label": "Shaft Turndown", "group": "BRG", "cis": 2 }, { "id": 237, "label": "Shaft Sleeve", "group": "BRG", "cis": 1 }, { "id": 238, "label": "Clad Shaft", "group": "BRG", "cis": 1 }, { "id": 239, "label": "Shaft Locking Collar", "group": "BRG", "cis": 1 }, { "id": 240, "label": "Fan Pedestal", "group": "BRG", "cis": 24 }, { "id": 241, "label": "Separated Pedestal", "group": "BRG", "cis": 1 }, { "id": 242, "label": "Shaft Seal", "group": "BRG", "cis": 162 }, { "id": 243, "label": "Lip Shaft Seal", "group": "BRG", "cis": 1 }, { "id": 244, "label": "Friction Shaft Seal", "group": "BRG", "cis": 1 }, { "id": 245, "label": "Carbon Ring Seal", "group": 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