| http://www.w3.org/ns/prov#value | - In a preferred embodiment, the power source 1 is a battery, the primary gate 4 and secondary gates 5, 6 and 7 are transistors, the primary control means 2 is a switch, the pattern-generation means 3 is a pattern-generation circuit (e.g., a counter), and the lamps 8, 9 and 10 are light-emitting diodes (LEDs).
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