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: Lead 6: Carbon 7: Water 8: Current 9: Human 10: Process 11: Range 12: Contamination 13: Environment 14: Fishery 15: Condition 16: Electricity 17: Conservation 18: Atom 19: Hazard 20: Subdivision (As of 11:43)