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1. Disposal of waste plastic can be difficult . Some plastics can be broken down by microbes and so are [biodegradable]. 2. Disposal of waste plastic can be difficult . Some plastics can be broken down by [microbes] and so are biodegradable. 3. Disposal of waste plastic can be difficult . Some [plastics] can be broken down by microbes and so are biodegradable. 4. [Disposal] of waste plastic can be difficult . Some plastics can be broken down by microbes and so are biodegradable. 5. Disposal of waste plastic can be difficult . Some plastics can be [broken] [down] by microbes and so are biodegradable. 6. Disposal of [waste] plastic can be difficult . Some plastics can be broken down by microbes and so are biodegradable..

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