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1. do not litter on the streets.
2. do not discharge into the environment of hazardous gases.
3. try not to litter and not to build a fire in the woods.
4. do not contaminate ponds.
5. try not to build a lot of factories.
2. do not discharge into the environment of hazardous gases.
3. try not to litter and not to build a fire in the woods.
4. do not contaminate ponds.
5. try not to build a lot of factories.
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