air
asthma
branches
breathing
bronchi
bronchial
cancer
care
clean
climate
clinic
conservation
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diagnose
disease
doctor
earth
ecology
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examination
forest
fresh
green
hands
health
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illness
leaves
man
medicine
nature
oncology
organ
oxygen
people
planet
plant
pollution
prevention
protection
pulmonary
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safe
save
shape
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symbol
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tree