| Trees: Martian Road Signs-A Dichotomous Key |
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1. If the sign is a circle, go to 2. If not, go to 7. 2. If the sign contains other circles, go to 3. If not, go to 4. 3. If the circle contains only one circle: Dragon Cemetery.
If the circle
contains two circles: Watch for Falling
Eggs 4. If circle contains only one straight line, go to 5. If not, go to 6. 5. If line is horizontal: Flying Saucer Crossroad. If line is vertical: Divided Highway 6. If lines make an X: Dragon Crossing. If lines make an M: Watch for Dragons Landing. 7. If sign is T-shaped at any position, go to 8. If not, go to 11. 8. If T is horizontal or sideways, go to 9. If not, go to 11. 9. If T handle points left: No Right Turn. If T handle points right: No Left Turn. 10. If T handle is in normal T position: road Ends, Must turn Left or Right. 11. If sign is triangular, go to 12. If not, go to 13. 12. If triangle point is down: Long Downhill Road. Of triangle points upward: Long Uphill Road. 13. If sign is diagonal or leaning, go to 14. If not, go to 15. 14. If sign leans to the right: Watch for Dragons Entering from Right.
If sign leans
to the left: Watch for Dragons Entering
from the Left. If sign is not a square, go to 16. 16. If sign is a horizontal rectangle: Standard Speed Limit. If sign is a vertical rectangle: Double Standard Speed. |
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