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HYDROFLUOROCARBONS (12) |
OZONE (12) |
OZONE LAYER (12) |
OZONE-DEPLETING SUBSTANCES (12) |
HYDROCHLOROFLUOROCARBONS (5) |
REFRIGERATION (5) |
GLOBAL WARMING (4) |
CHEMICALS (1) |
CHLOROFLUOROCARBONS (1) |
FIRE PREVENTION (1) |