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B2 U 10 Revision

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Machines reading people's emotions and reacting to them is a new (rising/turning/cuttting)-edge technology under research.

Machines reading people's emotions and reacting to them is a new cutting-edge technology under research.

Building a (prototype/trial/pattern) is the most practical and cost-effective solution in development of new devices.

Building a prototype is the most practical and cost-effective solution in development of new devices.

to have the idea for something and start it

originate

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