fluorescent bulbs and question |
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| navigate by keyword : add adding against alternative background bulb bulbs computer concept conceptual earth eco ecologic ecological ecology electricity energy environment environmental equal equals fluorescent friendly future generated global grass green group idea illustrated illustration isolated lamp lawn light lightbulb lightbulbs lights mark natural patches planet plant power question renewable resource saver saving savings spiral sustainable symbol technological technology tubes unknown warming white |
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| Fluorescent light bulbs on grass patches being added to equal a question mark as in unknown energy savings concept. |
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