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author
The author's attitude towards the speaker's remarks is critical.

oxygen
Passengers with heart disease may experience chest pains as result of the reduced amount of oxygen flowing through their blood.

concrete
The existing 643 miles of concrete-and-steel border fence would be maintained but no new barriers would be built.

reproduce
The organization says that animals must have food, water, shelter, health care and the ability to reproduce.

introduce
To speed up the delivery of letters, the Post Office introduced automatic sorting.

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