Cheating code

When I began to answer the question, a person coughed a few times. When the other person agreed, he snapped loudly. When he disagreed, he didn't respond.

Because of the limitation of technical conditions, it is best for the person in front to tell the answer and the person behind to answer it. The password is as follows:

The person in front touches his ear with his left hand, A, scratches his head with his left hand, B, touches his ear with his right hand, C, scratches his head with his right hand, D.

If the person in the back agrees, cough gently, quietly, or make other noises, such as knocking on the table and shaking off the paper. , can't attract attention.

The people behind disagreed, and there was also a code word: kick the left leg, A, twice, B, kick the right leg, C, twice, D.

These signals must be tested in advance, especially if they are done naturally and unobtrusively. For example, the person in front can lie prone on the table, as if absorbed in reading the topic, and then do the action with the minimum amplitude. The person behind should also observe the movements of the person in front with the corner of his eye. The action of kicking stool legs should also be practiced in advance, and it is not time.

The other party didn't feel it, or the action was too big.

Other small moves that are not easy to attract attention are: knocking on the table in a low voice, just like a person wondering how to do a problem, several fingers fall in turn; Turning the pen is louder than falling; Spit softly.