Why is 06110 Rough Carpentry separate from 06120 Lumber in the job cost codes found in Figure 2-6?

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Code Description 01000 GENERAL REQUIREMENTS 01100 Supervision 01400 General Labor 01600 Temporary Facilities 01700 Temporary Usities 01800 Temporary Phone 01900 Clean-Up 02000 EXISTING CONDITIONS 02050 Demolition 03000 CONCRETE 03200 Under-slab Gravel 03300 Footing & Found-Labor 03400 Footing & Found-Conc. 03450 Concrete Pump 03500 Slab/Roor-Labor 03600 Slab/Floor-Concreto 03650 Light Weight Concrete 03700 Pre-cast Concrete 03900 Robar 04000 MASONRY 04100 Masonry 05000 METALS 05100 Structural Stool 05300 Joist & Deck 05400 Misc. Stool 05900 Emotion 06000 WOOD, PLASTICS, & COMP. 06110 Rough Carpentry 06120 Lumber 06150 062 10 Trusses Finish Carpentry 07000 07100 07200 Insulation 07210 Foundation Insulation THERMAL & MOIST. PROT. Waterproofing 250 Fireproofing 07300 Stucco 07400 Siding 07450 Rain Gutters 07500 Roofing 07600 Flashings-Shoot Metal 07700 Roof Spedaties 07900 Caulking & Sealants COST CODES 08000 OPENINGS 08110 Metal Doors & Frames 08200 Wood Doo 08300 Overhead Doors 08400 Store Fronts 08700 Hardwar 08800 Glass & Glazing Code Description 09000 FINISHES 09050 Metal Studs 09100 Drywal 09200 Ceramic Tile 09300 Acoustical Treatment 09400 09800 Paint 09850 Carpet & Vinyl Wal Coverings 10000 SPECIALTIES 10400 Signage 10700 Toilet Partitions 10800 Toilet & Bath Accessories 11000 EQUIPMENT 11100 Appliances 12000 FURNISHINGS 12300 Cabinetry & Counter Tops 12350 Counter Tops 12500 Window Treatments 14000 CONVEYING SYSTEMS 14100 Elevators 20000 FIRE SUPPRESSION 21.100 Fire Sprinklers 22000 PLUMBING 22100 Plumbing 23000 HVAC 23100 HVAC 23200 Gas Lines 26000 ELECTRICAL 26100 Electrical 31000 EARTHWORK 31100 Grading & Excavation 32000 EXTERIOR IMPRO 32100 Asphalt 32200 Site Conc.-Labor 32300 Site Conc.-Concreto 32400 Signage 32500 Landscaping 32550 Fencing 32600 Dumpster Enclosures 32900 Outside Lighting 33000 UTILITIES 33100 33200 Water Line 33300 Storm Drain 33400 Gas Lines 33500 33600 Telephone Lines Sanitary Sawar Power Lines ENTS