A. We thought of trying to describe each emotion,but it would have been almost impossible to make clear rules for this.
B. These particular muscles are difficult to control,and few people can do it.
C. Research has also been done to find out which areas of the brain read emotional expressions.
D. They decided that it was a mental state that could be preceded by "I feel" or "he looks" or "she sounds".
E. He said that the expression of these feelings was universal and recognisable by anyone, from any culture.
F. Any other method of showing all the 412 emotions,such as words, would have been far less effective.