0 • A • B • C • D • E • F • G • H • I • J • K • L • M • N • O • P • Q • R • S • T • U • V • W • X • Y • Z
1: Active solar heating system 2: Soil 3: Community 4: Feeder 5: Carbon 6: Lead 7: Process 8: Current 9: Water 10: Range 11: Fishery 12: Contamination 13: Condition 14: Human 15: Environment 16: Atom 17: Electricity 18: Conservation 19: Hazard 20: Subdivision (As of 07:09)