USEFUL HARMFUL
1. PEN 1.ACIDS
2. paper 2.CAUSTIC
3. chopping board 3.heavy metals
4. tv. 4.DISINFECTANS
5.clock. 5.including mercury
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USEFUL HARMFUL
1. PEN 1.ACIDS
2. paper 2.CAUSTIC
3. chopping board 3.heavy metals
4. tv. 4.DISINFECTANS
5.clock. 5.including mercury