| 1 | Usage, Forwarding, Cost, Production, Time, System, Process, Tower, Harvest, Efficiency | Usage, Worker, Felling, Posture, Branch, Production, Removal, Evaluation |
| 2 | Improvement, Excavator, Education, Forest Management, Result, Forestry, Business, Machinery, Safety, Evaluation | Forest Management, Improvement, Fuction, Project, Education, Member, |
| 3 | Execution, Level, Core, Change, Policy, Average, Unit, Survey, Region, Method | Intensity, Level, Measurement, Mowing, Time |
| 4 | Tree Species, Development, Utilization, Afforestation, Judgement, Job, Branch, Impact, Target, Forest Road | - |