1B-natural
2D-discover
3C-way
4C-causes
5D-test
6A-experiment
7C-progress
8A-research
9D- reward
10A-clear
artifical
electric
motor
industry
taking place
modern
engine
1B-natural
2D-discover
3C-way
4C-causes
5D-test
6A-experiment
7C-progress
8A-research
9D- reward
10A-clear
artifical
electric
motor
industry
taking place
modern
engine